Mixing
Time: How to get the next friday?
50
How can I get the next friday with the Joda-Time API.
The LocalDate of today is today. It looks to me you have to decide whever you are before or after the friday of the current week. See this method:
private LocalDate calcNextFriday(LocalDate d) {
LocalDate friday = d.dayOfWeek().setCopy(5);
if (d.isBefore(friday)) {
return d.dayOfWeek().setCopy(5);
} else {
return d.plusWeeks(1).dayOfWeek().setCopy(5);
}
}
Is it possible to do it shorter or with a oneliner?
PS: Please don't advise me using JDKs date/time stuff. Joda-Time is a much better API.
Java 8 introduces java.time package (Tutorial) which is even better.
java date datetime time jodatime
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
add a comment |
50
How can I get the next friday with the Joda-Time API.
The LocalDate of today is today. It looks to me you have to decide whever you are before or after the friday of the current week. See this method:
private LocalDate calcNextFriday(LocalDate d) {
LocalDate friday = d.dayOfWeek().setCopy(5);
if (d.isBefore(friday)) {
return d.dayOfWeek().setCopy(5);
} else {
return d.plusWeeks(1).dayOfWeek().setCopy(5);
}
}
Is it possible to do it shorter or with a oneliner?
PS: Please don't advise me using JDKs date/time stuff. Joda-Time is a much better API.
Java 8 introduces java.time package (Tutorial) which is even better.
java date datetime time jodatime
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
2
good question...DateTimecould use arollForwardTo(...)method
– skaffman
Oct 28 '09 at 10:00
@skaffman See my generic rollForward answer. Its not super duper tested but seems to work for me.
– Adam Gent
Jul 18 '12 at 3:02
1
Actually, java.time is not necessarily better that Joda-Time. Each has features the other lacks. For example, java.time lacks theIntervalclass found in Joda-Time. So use each for its strengths. You can mix and match within a project. Just be careful with yourimportstatements as a few of their classes share the same name.
– Basil Bourque
Apr 18 '15 at 19:38
add a comment |
50
50
50
9
How can I get the next friday with the Joda-Time API.
The LocalDate of today is today. It looks to me you have to decide whever you are before or after the friday of the current week. See this method:
private LocalDate calcNextFriday(LocalDate d) {
LocalDate friday = d.dayOfWeek().setCopy(5);
if (d.isBefore(friday)) {
return d.dayOfWeek().setCopy(5);
} else {
return d.plusWeeks(1).dayOfWeek().setCopy(5);
}
}
Is it possible to do it shorter or with a oneliner?
PS: Please don't advise me using JDKs date/time stuff. Joda-Time is a much better API.
Java 8 introduces java.time package (Tutorial) which is even better.
java date datetime time jodatime
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
How can I get the next friday with the Joda-Time API.
The LocalDate of today is today. It looks to me you have to decide whever you are before or after the friday of the current week. See this method:
private LocalDate calcNextFriday(LocalDate d) {
LocalDate friday = d.dayOfWeek().setCopy(5);
if (d.isBefore(friday)) {
return d.dayOfWeek().setCopy(5);
} else {
return d.plusWeeks(1).dayOfWeek().setCopy(5);
}
}
Is it possible to do it shorter or with a oneliner?
PS: Please don't advise me using JDKs date/time stuff. Joda-Time is a much better API.
Java 8 introduces java.time package (Tutorial) which is even better.
java date datetime time jodatime
java date datetime time jodatime
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
edited Apr 18 '15 at 19:42
Basil Bourque
112k28385545
112k28385545
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
asked Oct 28 '09 at 9:16
michael.kebemichael.kebe
8,39823656
8,39823656
2
good question...DateTimecould use arollForwardTo(...)method
– skaffman
Oct 28 '09 at 10:00
@skaffman See my generic rollForward answer. Its not super duper tested but seems to work for me.
– Adam Gent
Jul 18 '12 at 3:02
1
Actually, java.time is not necessarily better that Joda-Time. Each has features the other lacks. For example, java.time lacks theIntervalclass found in Joda-Time. So use each for its strengths. You can mix and match within a project. Just be careful with yourimportstatements as a few of their classes share the same name.
– Basil Bourque
Apr 18 '15 at 19:38
add a comment |
2
good question...DateTimecould use arollForwardTo(...)method
– skaffman
Oct 28 '09 at 10:00
@skaffman See my generic rollForward answer. Its not super duper tested but seems to work for me.
– Adam Gent
Jul 18 '12 at 3:02
1
Actually, java.time is not necessarily better that Joda-Time. Each has features the other lacks. For example, java.time lacks theIntervalclass found in Joda-Time. So use each for its strengths. You can mix and match within a project. Just be careful with yourimportstatements as a few of their classes share the same name.
– Basil Bourque
Apr 18 '15 at 19:38
2
2
good question...
DateTime could use a rollForwardTo(...) method– skaffman
Oct 28 '09 at 10:00
good question...
DateTime could use a rollForwardTo(...) method– skaffman
Oct 28 '09 at 10:00
@skaffman See my generic rollForward answer. Its not super duper tested but seems to work for me.
– Adam Gent
Jul 18 '12 at 3:02
@skaffman See my generic rollForward answer. Its not super duper tested but seems to work for me.
– Adam Gent
Jul 18 '12 at 3:02
1
1
Actually, java.time is not necessarily better that Joda-Time. Each has features the other lacks. For example, java.time lacks the
Interval class found in Joda-Time. So use each for its strengths. You can mix and match within a project. Just be careful with your import statements as a few of their classes share the same name.– Basil Bourque
Apr 18 '15 at 19:38
Actually, java.time is not necessarily better that Joda-Time. Each has features the other lacks. For example, java.time lacks the
Interval class found in Joda-Time. So use each for its strengths. You can mix and match within a project. Just be careful with your import statements as a few of their classes share the same name.– Basil Bourque
Apr 18 '15 at 19:38
add a comment |
7 Answers
7
active
oldest
votes
57
java.time
With the java.time framework built into Java 8 and later (Tutorial) you can use TemporalAdjusters to get next or previous day-of-week.
private LocalDate calcNextFriday(LocalDate d) {
return d.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
}
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
Does this uses joda-time?
– Christopher Francisco
May 26 '16 at 16:07
2
No, but it developed from it. Here a quote from the joda time homepage: Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).
– michael.kebe
May 27 '16 at 19:40
2
FYI, the java.time classes are built into Java 8 and later. Much of the java.time functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. Also, see Oracle Tutorial to learn more.
– Basil Bourque
Jun 30 '16 at 0:33
add a comment |
52
It's possible to do it in a much easier to read way:
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
return d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else if (d.getDayOfWeek() == DateTimeConstants.FRIDAY) {
// almost useless branch, could be merged with the one above
return d;
} else {
return d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
or in a bit shorter form
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
d = d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else {
d = d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
return d; // note that there's a possibility original object is returned
}
or even shorter
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() >= DateTimeConstants.FRIDAY) {
d = d.plusWeeks(1);
}
return d.withDayOfWeek(DateTimeConstants.FRIDAY);
}
PS. I didn't test the actual code! :)
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
2
or compile it ... "DateTimeConstans"
– David Victor
Sep 14 '11 at 11:53
8
@David You saw nothing ;)
– Esko
Jan 23 '12 at 11:44
5
+1 for sense of humour. :)
– David Victor
Jan 23 '12 at 15:16
Your last snippet's "return" line contains a redundant ")" character. Anyways, thanks, great solution!
– gyorgyabraham
Aug 16 '13 at 15:32
add a comment |
5
Your code in 1 line
private LocalDate calcNextFriday3(LocalDate d) {
return d.isBefore(d.dayOfWeek().setCopy(5))?d.dayOfWeek().setCopy(5):d.plusWeeks(1).dayOfWeek().setCopy(5);
}
Alternative approach
private LocalDate calcNextDay(LocalDate d, int weekday) {
return (d.getDayOfWeek() < weekday)?d.withDayOfWeek(weekday):d.plusWeeks(1).withDayOfWeek(weekday);
}
private LocalDate calcNextFriday2(LocalDate d) {
return calcNextDay(d,DateTimeConstants.FRIDAY);
}
somewhat tested ;-)
answered Oct 28 '09 at 10:06
fvufvu
29k54769
1
Thanks for your answer. Your suggestion with the more general approach is nice. But the oneliner is awkward in term of readability.
– michael.kebe
Oct 28 '09 at 10:27
5
@michaelkebe you asked for a oneliner, I just provided one... ;-)
– fvu
Oct 28 '09 at 10:39
1
@michael.kebe I usually place newlines with ternaries at "?" and ":", hit format in Eclipse and it arranges pretty well.
– gyorgyabraham
Aug 16 '13 at 15:51
add a comment |
4
I just wasted like 30 minutes trying to figure this out myself but I needed to generically roll forward.
Anyway here is my solution:
public static DateTime rollForwardWith(ReadableInstant now, AbstractPartial lp) {
DateTime dt = lp.toDateTime(now);
while (dt.isBefore(now)) {
dt = dt.withFieldAdded(lp.getFieldTypes()[0].getRangeDurationType(), 1);
}
return dt;
}
Now you just need to make a Partial (which LocalDate is) for the day of the week.
Partial().with(DateTimeFieldType.dayOfWeek(), DateTimeConstants.FRIDAY);
Now whatever the most significant field is of the partial will be +1 if the current date is after it (now).
That is if you make a partial with March 2012 it will create a new datetime of March 2013 or <.
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
add a comment |
4
import java.util.Calendar;
private Calendar getNextweekOfDay(int weekOfDay) {
Calendar today = Calendar.getInstance();
int dayOfWeek = today.get(Calendar.DAY_OF_WEEK);
int daysUntilNextWeekOfDay = weekOfDay - dayOfWeek;
if (daysUntilNextWeekOfDay == 0) daysUntilNextWeekOfDay = 7;
Calendar nextWeekOfDay = (Calendar)today.clone();
nextWeekOfDay.add(Calendar.DAY_OF_WEEK, daysUntilNextWeekOfDay);
return nextWeekOfDay;
}
// set alarm for next Friday 9am
public void setAlarm() {
Calendar calAlarm = getNextweekOfDay(Calendar.FRIDAY);
calAlarm.set(Calendar.HOUR_OF_DAY, 9);//9am
calAlarm.set(Calendar.MINUTE, 0);
calAlarm.set(Calendar.SECOND, 0);
scheduleAlarm(calAlarm);// this is my own method to schedule a pendingIntent
}
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:15
add a comment |
3
counting bytes @fvu answer can be shortened even further to:
private LocalDate calcNextFriday(LocalDate d) {
return d.plusWeeks(d.getDayOfWeek() < DateTimeConstants.FRIDAY ? 0 : 1).withDayOfWeek(DateTimeConstants.FRIDAY);
}
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
add a comment |
0
A simple modulo based solution which should work with most of former java versions in case you are not allowed to upgrade your java version to java8 or onwards or to use a standard java date library as jodatime
Number of days to add to your date is given by this formula :
(7 + Calendar.FRIDAY - yourDateAsCalendar.get(Calendar.DAY_OF_WEEK)) % 7
Note also this can be generalized for any week day by changing the static field Calendar.FRIDAY to your given weekday. Some snippet code below
public static void main(String args) {
for (int i = 0; i < 15; i++) {
Calendar cur = Calendar.getInstance();
cur.add(Calendar.DAY_OF_MONTH, i);
Calendar friday = Calendar.getInstance();
friday.setTime(cur.getTime());
friday.add(Calendar.DAY_OF_MONTH, (7 + Calendar.FRIDAY - cur.get(Calendar.DAY_OF_WEEK)) % 7);
System.out.println(MessageFormat.format("Date {0} -> {1} ", cur.getTime(), friday.getTime()));
}
}
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:14
Yes If you use java 8 or onwards version or Jodatime, this is not for you. I did say it but i was not clear. Thanks for commenting.
– Breton F.
Dec 7 '18 at 15:26
add a comment |
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7 Answers
7
active
oldest
votes
7 Answers
7
active
oldest
votes
active
oldest
votes
active
oldest
votes
57
java.time
With the java.time framework built into Java 8 and later (Tutorial) you can use TemporalAdjusters to get next or previous day-of-week.
private LocalDate calcNextFriday(LocalDate d) {
return d.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
}
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
Does this uses joda-time?
– Christopher Francisco
May 26 '16 at 16:07
2
No, but it developed from it. Here a quote from the joda time homepage: Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).
– michael.kebe
May 27 '16 at 19:40
2
FYI, the java.time classes are built into Java 8 and later. Much of the java.time functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. Also, see Oracle Tutorial to learn more.
– Basil Bourque
Jun 30 '16 at 0:33
add a comment |
57
java.time
With the java.time framework built into Java 8 and later (Tutorial) you can use TemporalAdjusters to get next or previous day-of-week.
private LocalDate calcNextFriday(LocalDate d) {
return d.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
}
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
Does this uses joda-time?
– Christopher Francisco
May 26 '16 at 16:07
2
No, but it developed from it. Here a quote from the joda time homepage: Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).
– michael.kebe
May 27 '16 at 19:40
2
FYI, the java.time classes are built into Java 8 and later. Much of the java.time functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. Also, see Oracle Tutorial to learn more.
– Basil Bourque
Jun 30 '16 at 0:33
add a comment |
57
57
57
java.time
With the java.time framework built into Java 8 and later (Tutorial) you can use TemporalAdjusters to get next or previous day-of-week.
private LocalDate calcNextFriday(LocalDate d) {
return d.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
}
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
java.time
With the java.time framework built into Java 8 and later (Tutorial) you can use TemporalAdjusters to get next or previous day-of-week.
private LocalDate calcNextFriday(LocalDate d) {
return d.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
}
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
edited Jun 30 '16 at 0:31
Basil Bourque
112k28385545
112k28385545
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
answered Mar 12 '15 at 12:53
michael.kebemichael.kebe
8,39823656
8,39823656
Does this uses joda-time?
– Christopher Francisco
May 26 '16 at 16:07
2
No, but it developed from it. Here a quote from the joda time homepage: Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).
– michael.kebe
May 27 '16 at 19:40
2
FYI, the java.time classes are built into Java 8 and later. Much of the java.time functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. Also, see Oracle Tutorial to learn more.
– Basil Bourque
Jun 30 '16 at 0:33
add a comment |
Does this uses joda-time?
– Christopher Francisco
May 26 '16 at 16:07
2
No, but it developed from it. Here a quote from the joda time homepage: Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).
– michael.kebe
May 27 '16 at 19:40
2
FYI, the java.time classes are built into Java 8 and later. Much of the java.time functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. Also, see Oracle Tutorial to learn more.
– Basil Bourque
Jun 30 '16 at 0:33
Does this uses joda-time?
– Christopher Francisco
May 26 '16 at 16:07
Does this uses joda-time?
– Christopher Francisco
May 26 '16 at 16:07
2
2
No, but it developed from it. Here a quote from the joda time homepage: Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).
– michael.kebe
May 27 '16 at 19:40
No, but it developed from it. Here a quote from the joda time homepage: Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).
– michael.kebe
May 27 '16 at 19:40
2
2
FYI, the java.time classes are built into Java 8 and later. Much of the java.time functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. Also, see Oracle Tutorial to learn more.
– Basil Bourque
Jun 30 '16 at 0:33
FYI, the java.time classes are built into Java 8 and later. Much of the java.time functionality has been back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP. Also, see Oracle Tutorial to learn more.
– Basil Bourque
Jun 30 '16 at 0:33
add a comment |
52
It's possible to do it in a much easier to read way:
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
return d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else if (d.getDayOfWeek() == DateTimeConstants.FRIDAY) {
// almost useless branch, could be merged with the one above
return d;
} else {
return d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
or in a bit shorter form
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
d = d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else {
d = d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
return d; // note that there's a possibility original object is returned
}
or even shorter
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() >= DateTimeConstants.FRIDAY) {
d = d.plusWeeks(1);
}
return d.withDayOfWeek(DateTimeConstants.FRIDAY);
}
PS. I didn't test the actual code! :)
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
2
or compile it ... "DateTimeConstans"
– David Victor
Sep 14 '11 at 11:53
8
@David You saw nothing ;)
– Esko
Jan 23 '12 at 11:44
5
+1 for sense of humour. :)
– David Victor
Jan 23 '12 at 15:16
Your last snippet's "return" line contains a redundant ")" character. Anyways, thanks, great solution!
– gyorgyabraham
Aug 16 '13 at 15:32
add a comment |
52
It's possible to do it in a much easier to read way:
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
return d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else if (d.getDayOfWeek() == DateTimeConstants.FRIDAY) {
// almost useless branch, could be merged with the one above
return d;
} else {
return d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
or in a bit shorter form
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
d = d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else {
d = d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
return d; // note that there's a possibility original object is returned
}
or even shorter
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() >= DateTimeConstants.FRIDAY) {
d = d.plusWeeks(1);
}
return d.withDayOfWeek(DateTimeConstants.FRIDAY);
}
PS. I didn't test the actual code! :)
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
2
or compile it ... "DateTimeConstans"
– David Victor
Sep 14 '11 at 11:53
8
@David You saw nothing ;)
– Esko
Jan 23 '12 at 11:44
5
+1 for sense of humour. :)
– David Victor
Jan 23 '12 at 15:16
Your last snippet's "return" line contains a redundant ")" character. Anyways, thanks, great solution!
– gyorgyabraham
Aug 16 '13 at 15:32
add a comment |
52
52
52
It's possible to do it in a much easier to read way:
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
return d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else if (d.getDayOfWeek() == DateTimeConstants.FRIDAY) {
// almost useless branch, could be merged with the one above
return d;
} else {
return d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
or in a bit shorter form
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
d = d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else {
d = d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
return d; // note that there's a possibility original object is returned
}
or even shorter
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() >= DateTimeConstants.FRIDAY) {
d = d.plusWeeks(1);
}
return d.withDayOfWeek(DateTimeConstants.FRIDAY);
}
PS. I didn't test the actual code! :)
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
It's possible to do it in a much easier to read way:
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
return d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else if (d.getDayOfWeek() == DateTimeConstants.FRIDAY) {
// almost useless branch, could be merged with the one above
return d;
} else {
return d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
or in a bit shorter form
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() < DateTimeConstants.FRIDAY) {
d = d.withDayOfWeek(DateTimeConstants.FRIDAY));
} else {
d = d.plusWeeks(1).withDayOfWeek(DateTimeConstants.FRIDAY));
}
return d; // note that there's a possibility original object is returned
}
or even shorter
private LocalDate calcNextFriday(LocalDate d) {
if (d.getDayOfWeek() >= DateTimeConstants.FRIDAY) {
d = d.plusWeeks(1);
}
return d.withDayOfWeek(DateTimeConstants.FRIDAY);
}
PS. I didn't test the actual code! :)
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
edited Nov 7 '13 at 19:34
Jason Sperske
22.8k855107
22.8k855107
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
answered Oct 28 '09 at 9:56
EskoEsko
23.4k104776
23.4k104776
2
or compile it ... "DateTimeConstans"
– David Victor
Sep 14 '11 at 11:53
8
@David You saw nothing ;)
– Esko
Jan 23 '12 at 11:44
5
+1 for sense of humour. :)
– David Victor
Jan 23 '12 at 15:16
Your last snippet's "return" line contains a redundant ")" character. Anyways, thanks, great solution!
– gyorgyabraham
Aug 16 '13 at 15:32
add a comment |
2
or compile it ... "DateTimeConstans"
– David Victor
Sep 14 '11 at 11:53
8
@David You saw nothing ;)
– Esko
Jan 23 '12 at 11:44
5
+1 for sense of humour. :)
– David Victor
Jan 23 '12 at 15:16
Your last snippet's "return" line contains a redundant ")" character. Anyways, thanks, great solution!
– gyorgyabraham
Aug 16 '13 at 15:32
2
2
or compile it ... "DateTimeConstans"
– David Victor
Sep 14 '11 at 11:53
or compile it ... "DateTimeConstans"
– David Victor
Sep 14 '11 at 11:53
8
8
@David You saw nothing ;)
– Esko
Jan 23 '12 at 11:44
@David You saw nothing ;)
– Esko
Jan 23 '12 at 11:44
5
5
+1 for sense of humour. :)
– David Victor
Jan 23 '12 at 15:16
+1 for sense of humour. :)
– David Victor
Jan 23 '12 at 15:16
Your last snippet's "return" line contains a redundant ")" character. Anyways, thanks, great solution!
– gyorgyabraham
Aug 16 '13 at 15:32
Your last snippet's "return" line contains a redundant ")" character. Anyways, thanks, great solution!
– gyorgyabraham
Aug 16 '13 at 15:32
add a comment |
5
Your code in 1 line
private LocalDate calcNextFriday3(LocalDate d) {
return d.isBefore(d.dayOfWeek().setCopy(5))?d.dayOfWeek().setCopy(5):d.plusWeeks(1).dayOfWeek().setCopy(5);
}
Alternative approach
private LocalDate calcNextDay(LocalDate d, int weekday) {
return (d.getDayOfWeek() < weekday)?d.withDayOfWeek(weekday):d.plusWeeks(1).withDayOfWeek(weekday);
}
private LocalDate calcNextFriday2(LocalDate d) {
return calcNextDay(d,DateTimeConstants.FRIDAY);
}
somewhat tested ;-)
answered Oct 28 '09 at 10:06
fvufvu
29k54769
1
Thanks for your answer. Your suggestion with the more general approach is nice. But the oneliner is awkward in term of readability.
– michael.kebe
Oct 28 '09 at 10:27
5
@michaelkebe you asked for a oneliner, I just provided one... ;-)
– fvu
Oct 28 '09 at 10:39
1
@michael.kebe I usually place newlines with ternaries at "?" and ":", hit format in Eclipse and it arranges pretty well.
– gyorgyabraham
Aug 16 '13 at 15:51
add a comment |
5
Your code in 1 line
private LocalDate calcNextFriday3(LocalDate d) {
return d.isBefore(d.dayOfWeek().setCopy(5))?d.dayOfWeek().setCopy(5):d.plusWeeks(1).dayOfWeek().setCopy(5);
}
Alternative approach
private LocalDate calcNextDay(LocalDate d, int weekday) {
return (d.getDayOfWeek() < weekday)?d.withDayOfWeek(weekday):d.plusWeeks(1).withDayOfWeek(weekday);
}
private LocalDate calcNextFriday2(LocalDate d) {
return calcNextDay(d,DateTimeConstants.FRIDAY);
}
somewhat tested ;-)
answered Oct 28 '09 at 10:06
fvufvu
29k54769
1
Thanks for your answer. Your suggestion with the more general approach is nice. But the oneliner is awkward in term of readability.
– michael.kebe
Oct 28 '09 at 10:27
5
@michaelkebe you asked for a oneliner, I just provided one... ;-)
– fvu
Oct 28 '09 at 10:39
1
@michael.kebe I usually place newlines with ternaries at "?" and ":", hit format in Eclipse and it arranges pretty well.
– gyorgyabraham
Aug 16 '13 at 15:51
add a comment |
5
5
5
Your code in 1 line
private LocalDate calcNextFriday3(LocalDate d) {
return d.isBefore(d.dayOfWeek().setCopy(5))?d.dayOfWeek().setCopy(5):d.plusWeeks(1).dayOfWeek().setCopy(5);
}
Alternative approach
private LocalDate calcNextDay(LocalDate d, int weekday) {
return (d.getDayOfWeek() < weekday)?d.withDayOfWeek(weekday):d.plusWeeks(1).withDayOfWeek(weekday);
}
private LocalDate calcNextFriday2(LocalDate d) {
return calcNextDay(d,DateTimeConstants.FRIDAY);
}
somewhat tested ;-)
answered Oct 28 '09 at 10:06
fvufvu
29k54769
Your code in 1 line
private LocalDate calcNextFriday3(LocalDate d) {
return d.isBefore(d.dayOfWeek().setCopy(5))?d.dayOfWeek().setCopy(5):d.plusWeeks(1).dayOfWeek().setCopy(5);
}
Alternative approach
private LocalDate calcNextDay(LocalDate d, int weekday) {
return (d.getDayOfWeek() < weekday)?d.withDayOfWeek(weekday):d.plusWeeks(1).withDayOfWeek(weekday);
}
private LocalDate calcNextFriday2(LocalDate d) {
return calcNextDay(d,DateTimeConstants.FRIDAY);
}
somewhat tested ;-)
answered Oct 28 '09 at 10:06
fvufvu
29k54769
answered Oct 28 '09 at 10:06
fvufvu
29k54769
answered Oct 28 '09 at 10:06
fvufvu
29k54769
answered Oct 28 '09 at 10:06
fvufvu
29k54769
29k54769
1
Thanks for your answer. Your suggestion with the more general approach is nice. But the oneliner is awkward in term of readability.
– michael.kebe
Oct 28 '09 at 10:27
5
@michaelkebe you asked for a oneliner, I just provided one... ;-)
– fvu
Oct 28 '09 at 10:39
1
@michael.kebe I usually place newlines with ternaries at "?" and ":", hit format in Eclipse and it arranges pretty well.
– gyorgyabraham
Aug 16 '13 at 15:51
add a comment |
1
Thanks for your answer. Your suggestion with the more general approach is nice. But the oneliner is awkward in term of readability.
– michael.kebe
Oct 28 '09 at 10:27
5
@michaelkebe you asked for a oneliner, I just provided one... ;-)
– fvu
Oct 28 '09 at 10:39
1
@michael.kebe I usually place newlines with ternaries at "?" and ":", hit format in Eclipse and it arranges pretty well.
– gyorgyabraham
Aug 16 '13 at 15:51
1
1
Thanks for your answer. Your suggestion with the more general approach is nice. But the oneliner is awkward in term of readability.
– michael.kebe
Oct 28 '09 at 10:27
Thanks for your answer. Your suggestion with the more general approach is nice. But the oneliner is awkward in term of readability.
– michael.kebe
Oct 28 '09 at 10:27
5
5
@michaelkebe you asked for a oneliner, I just provided one... ;-)
– fvu
Oct 28 '09 at 10:39
@michaelkebe you asked for a oneliner, I just provided one... ;-)
– fvu
Oct 28 '09 at 10:39
1
1
@michael.kebe I usually place newlines with ternaries at "?" and ":", hit format in Eclipse and it arranges pretty well.
– gyorgyabraham
Aug 16 '13 at 15:51
@michael.kebe I usually place newlines with ternaries at "?" and ":", hit format in Eclipse and it arranges pretty well.
– gyorgyabraham
Aug 16 '13 at 15:51
add a comment |
4
I just wasted like 30 minutes trying to figure this out myself but I needed to generically roll forward.
Anyway here is my solution:
public static DateTime rollForwardWith(ReadableInstant now, AbstractPartial lp) {
DateTime dt = lp.toDateTime(now);
while (dt.isBefore(now)) {
dt = dt.withFieldAdded(lp.getFieldTypes()[0].getRangeDurationType(), 1);
}
return dt;
}
Now you just need to make a Partial (which LocalDate is) for the day of the week.
Partial().with(DateTimeFieldType.dayOfWeek(), DateTimeConstants.FRIDAY);
Now whatever the most significant field is of the partial will be +1 if the current date is after it (now).
That is if you make a partial with March 2012 it will create a new datetime of March 2013 or <.
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
add a comment |
4
I just wasted like 30 minutes trying to figure this out myself but I needed to generically roll forward.
Anyway here is my solution:
public static DateTime rollForwardWith(ReadableInstant now, AbstractPartial lp) {
DateTime dt = lp.toDateTime(now);
while (dt.isBefore(now)) {
dt = dt.withFieldAdded(lp.getFieldTypes()[0].getRangeDurationType(), 1);
}
return dt;
}
Now you just need to make a Partial (which LocalDate is) for the day of the week.
Partial().with(DateTimeFieldType.dayOfWeek(), DateTimeConstants.FRIDAY);
Now whatever the most significant field is of the partial will be +1 if the current date is after it (now).
That is if you make a partial with March 2012 it will create a new datetime of March 2013 or <.
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
add a comment |
4
4
4
I just wasted like 30 minutes trying to figure this out myself but I needed to generically roll forward.
Anyway here is my solution:
public static DateTime rollForwardWith(ReadableInstant now, AbstractPartial lp) {
DateTime dt = lp.toDateTime(now);
while (dt.isBefore(now)) {
dt = dt.withFieldAdded(lp.getFieldTypes()[0].getRangeDurationType(), 1);
}
return dt;
}
Now you just need to make a Partial (which LocalDate is) for the day of the week.
Partial().with(DateTimeFieldType.dayOfWeek(), DateTimeConstants.FRIDAY);
Now whatever the most significant field is of the partial will be +1 if the current date is after it (now).
That is if you make a partial with March 2012 it will create a new datetime of March 2013 or <.
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
I just wasted like 30 minutes trying to figure this out myself but I needed to generically roll forward.
Anyway here is my solution:
public static DateTime rollForwardWith(ReadableInstant now, AbstractPartial lp) {
DateTime dt = lp.toDateTime(now);
while (dt.isBefore(now)) {
dt = dt.withFieldAdded(lp.getFieldTypes()[0].getRangeDurationType(), 1);
}
return dt;
}
Now you just need to make a Partial (which LocalDate is) for the day of the week.
Partial().with(DateTimeFieldType.dayOfWeek(), DateTimeConstants.FRIDAY);
Now whatever the most significant field is of the partial will be +1 if the current date is after it (now).
That is if you make a partial with March 2012 it will create a new datetime of March 2013 or <.
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
edited Jul 18 '12 at 3:13
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
answered Jul 18 '12 at 3:01
Adam GentAdam Gent
34.6k19125167
34.6k19125167
add a comment |
add a comment |
4
import java.util.Calendar;
private Calendar getNextweekOfDay(int weekOfDay) {
Calendar today = Calendar.getInstance();
int dayOfWeek = today.get(Calendar.DAY_OF_WEEK);
int daysUntilNextWeekOfDay = weekOfDay - dayOfWeek;
if (daysUntilNextWeekOfDay == 0) daysUntilNextWeekOfDay = 7;
Calendar nextWeekOfDay = (Calendar)today.clone();
nextWeekOfDay.add(Calendar.DAY_OF_WEEK, daysUntilNextWeekOfDay);
return nextWeekOfDay;
}
// set alarm for next Friday 9am
public void setAlarm() {
Calendar calAlarm = getNextweekOfDay(Calendar.FRIDAY);
calAlarm.set(Calendar.HOUR_OF_DAY, 9);//9am
calAlarm.set(Calendar.MINUTE, 0);
calAlarm.set(Calendar.SECOND, 0);
scheduleAlarm(calAlarm);// this is my own method to schedule a pendingIntent
}
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:15
add a comment |
4
import java.util.Calendar;
private Calendar getNextweekOfDay(int weekOfDay) {
Calendar today = Calendar.getInstance();
int dayOfWeek = today.get(Calendar.DAY_OF_WEEK);
int daysUntilNextWeekOfDay = weekOfDay - dayOfWeek;
if (daysUntilNextWeekOfDay == 0) daysUntilNextWeekOfDay = 7;
Calendar nextWeekOfDay = (Calendar)today.clone();
nextWeekOfDay.add(Calendar.DAY_OF_WEEK, daysUntilNextWeekOfDay);
return nextWeekOfDay;
}
// set alarm for next Friday 9am
public void setAlarm() {
Calendar calAlarm = getNextweekOfDay(Calendar.FRIDAY);
calAlarm.set(Calendar.HOUR_OF_DAY, 9);//9am
calAlarm.set(Calendar.MINUTE, 0);
calAlarm.set(Calendar.SECOND, 0);
scheduleAlarm(calAlarm);// this is my own method to schedule a pendingIntent
}
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:15
add a comment |
4
4
4
import java.util.Calendar;
private Calendar getNextweekOfDay(int weekOfDay) {
Calendar today = Calendar.getInstance();
int dayOfWeek = today.get(Calendar.DAY_OF_WEEK);
int daysUntilNextWeekOfDay = weekOfDay - dayOfWeek;
if (daysUntilNextWeekOfDay == 0) daysUntilNextWeekOfDay = 7;
Calendar nextWeekOfDay = (Calendar)today.clone();
nextWeekOfDay.add(Calendar.DAY_OF_WEEK, daysUntilNextWeekOfDay);
return nextWeekOfDay;
}
// set alarm for next Friday 9am
public void setAlarm() {
Calendar calAlarm = getNextweekOfDay(Calendar.FRIDAY);
calAlarm.set(Calendar.HOUR_OF_DAY, 9);//9am
calAlarm.set(Calendar.MINUTE, 0);
calAlarm.set(Calendar.SECOND, 0);
scheduleAlarm(calAlarm);// this is my own method to schedule a pendingIntent
}
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
import java.util.Calendar;
private Calendar getNextweekOfDay(int weekOfDay) {
Calendar today = Calendar.getInstance();
int dayOfWeek = today.get(Calendar.DAY_OF_WEEK);
int daysUntilNextWeekOfDay = weekOfDay - dayOfWeek;
if (daysUntilNextWeekOfDay == 0) daysUntilNextWeekOfDay = 7;
Calendar nextWeekOfDay = (Calendar)today.clone();
nextWeekOfDay.add(Calendar.DAY_OF_WEEK, daysUntilNextWeekOfDay);
return nextWeekOfDay;
}
// set alarm for next Friday 9am
public void setAlarm() {
Calendar calAlarm = getNextweekOfDay(Calendar.FRIDAY);
calAlarm.set(Calendar.HOUR_OF_DAY, 9);//9am
calAlarm.set(Calendar.MINUTE, 0);
calAlarm.set(Calendar.SECOND, 0);
scheduleAlarm(calAlarm);// this is my own method to schedule a pendingIntent
}
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
edited Apr 24 '18 at 16:55
Someone Somewhere
18.8k1096140
18.8k1096140
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
answered Jun 16 '15 at 7:19
dinesh pazanidinesh pazani
487
487
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:15
add a comment |
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:15
FYI, the terribly troublesome old date-time classes such as
java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.– Basil Bourque
Nov 30 '18 at 1:15
FYI, the terribly troublesome old date-time classes such as
java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.– Basil Bourque
Nov 30 '18 at 1:15
add a comment |
3
counting bytes @fvu answer can be shortened even further to:
private LocalDate calcNextFriday(LocalDate d) {
return d.plusWeeks(d.getDayOfWeek() < DateTimeConstants.FRIDAY ? 0 : 1).withDayOfWeek(DateTimeConstants.FRIDAY);
}
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
add a comment |
3
counting bytes @fvu answer can be shortened even further to:
private LocalDate calcNextFriday(LocalDate d) {
return d.plusWeeks(d.getDayOfWeek() < DateTimeConstants.FRIDAY ? 0 : 1).withDayOfWeek(DateTimeConstants.FRIDAY);
}
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
add a comment |
3
3
3
counting bytes @fvu answer can be shortened even further to:
private LocalDate calcNextFriday(LocalDate d) {
return d.plusWeeks(d.getDayOfWeek() < DateTimeConstants.FRIDAY ? 0 : 1).withDayOfWeek(DateTimeConstants.FRIDAY);
}
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
counting bytes @fvu answer can be shortened even further to:
private LocalDate calcNextFriday(LocalDate d) {
return d.plusWeeks(d.getDayOfWeek() < DateTimeConstants.FRIDAY ? 0 : 1).withDayOfWeek(DateTimeConstants.FRIDAY);
}
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
answered Oct 6 '14 at 10:18
Stefan HaberlStefan Haberl
4,17333951
4,17333951
add a comment |
add a comment |
0
A simple modulo based solution which should work with most of former java versions in case you are not allowed to upgrade your java version to java8 or onwards or to use a standard java date library as jodatime
Number of days to add to your date is given by this formula :
(7 + Calendar.FRIDAY - yourDateAsCalendar.get(Calendar.DAY_OF_WEEK)) % 7
Note also this can be generalized for any week day by changing the static field Calendar.FRIDAY to your given weekday. Some snippet code below
public static void main(String args) {
for (int i = 0; i < 15; i++) {
Calendar cur = Calendar.getInstance();
cur.add(Calendar.DAY_OF_MONTH, i);
Calendar friday = Calendar.getInstance();
friday.setTime(cur.getTime());
friday.add(Calendar.DAY_OF_MONTH, (7 + Calendar.FRIDAY - cur.get(Calendar.DAY_OF_WEEK)) % 7);
System.out.println(MessageFormat.format("Date {0} -> {1} ", cur.getTime(), friday.getTime()));
}
}
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:14
Yes If you use java 8 or onwards version or Jodatime, this is not for you. I did say it but i was not clear. Thanks for commenting.
– Breton F.
Dec 7 '18 at 15:26
add a comment |
0
A simple modulo based solution which should work with most of former java versions in case you are not allowed to upgrade your java version to java8 or onwards or to use a standard java date library as jodatime
Number of days to add to your date is given by this formula :
(7 + Calendar.FRIDAY - yourDateAsCalendar.get(Calendar.DAY_OF_WEEK)) % 7
Note also this can be generalized for any week day by changing the static field Calendar.FRIDAY to your given weekday. Some snippet code below
public static void main(String args) {
for (int i = 0; i < 15; i++) {
Calendar cur = Calendar.getInstance();
cur.add(Calendar.DAY_OF_MONTH, i);
Calendar friday = Calendar.getInstance();
friday.setTime(cur.getTime());
friday.add(Calendar.DAY_OF_MONTH, (7 + Calendar.FRIDAY - cur.get(Calendar.DAY_OF_WEEK)) % 7);
System.out.println(MessageFormat.format("Date {0} -> {1} ", cur.getTime(), friday.getTime()));
}
}
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:14
Yes If you use java 8 or onwards version or Jodatime, this is not for you. I did say it but i was not clear. Thanks for commenting.
– Breton F.
Dec 7 '18 at 15:26
add a comment |
0
0
0
A simple modulo based solution which should work with most of former java versions in case you are not allowed to upgrade your java version to java8 or onwards or to use a standard java date library as jodatime
Number of days to add to your date is given by this formula :
(7 + Calendar.FRIDAY - yourDateAsCalendar.get(Calendar.DAY_OF_WEEK)) % 7
Note also this can be generalized for any week day by changing the static field Calendar.FRIDAY to your given weekday. Some snippet code below
public static void main(String args) {
for (int i = 0; i < 15; i++) {
Calendar cur = Calendar.getInstance();
cur.add(Calendar.DAY_OF_MONTH, i);
Calendar friday = Calendar.getInstance();
friday.setTime(cur.getTime());
friday.add(Calendar.DAY_OF_MONTH, (7 + Calendar.FRIDAY - cur.get(Calendar.DAY_OF_WEEK)) % 7);
System.out.println(MessageFormat.format("Date {0} -> {1} ", cur.getTime(), friday.getTime()));
}
}
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
A simple modulo based solution which should work with most of former java versions in case you are not allowed to upgrade your java version to java8 or onwards or to use a standard java date library as jodatime
Number of days to add to your date is given by this formula :
(7 + Calendar.FRIDAY - yourDateAsCalendar.get(Calendar.DAY_OF_WEEK)) % 7
Note also this can be generalized for any week day by changing the static field Calendar.FRIDAY to your given weekday. Some snippet code below
public static void main(String args) {
for (int i = 0; i < 15; i++) {
Calendar cur = Calendar.getInstance();
cur.add(Calendar.DAY_OF_MONTH, i);
Calendar friday = Calendar.getInstance();
friday.setTime(cur.getTime());
friday.add(Calendar.DAY_OF_MONTH, (7 + Calendar.FRIDAY - cur.get(Calendar.DAY_OF_WEEK)) % 7);
System.out.println(MessageFormat.format("Date {0} -> {1} ", cur.getTime(), friday.getTime()));
}
}
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
edited Dec 7 '18 at 15:27
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
answered Nov 22 '18 at 1:39
Breton F.Breton F.
896
896
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:14
Yes If you use java 8 or onwards version or Jodatime, this is not for you. I did say it but i was not clear. Thanks for commenting.
– Breton F.
Dec 7 '18 at 15:26
add a comment |
FYI, the terribly troublesome old date-time classes such asjava.util.Date,java.util.Calendar, andjava.text.SimpleDateFormatare now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Nov 30 '18 at 1:14
Yes If you use java 8 or onwards version or Jodatime, this is not for you. I did say it but i was not clear. Thanks for commenting.
– Breton F.
Dec 7 '18 at 15:26
FYI, the terribly troublesome old date-time classes such as
java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.– Basil Bourque
Nov 30 '18 at 1:14
FYI, the terribly troublesome old date-time classes such as
java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.– Basil Bourque
Nov 30 '18 at 1:14
Yes If you use java 8 or onwards version or Jodatime, this is not for you. I did say it but i was not clear. Thanks for commenting.
– Breton F.
Dec 7 '18 at 15:26
Yes If you use java 8 or onwards version or Jodatime, this is not for you. I did say it but i was not clear. Thanks for commenting.
– Breton F.
Dec 7 '18 at 15:26
add a comment |
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2
good question...
DateTimecould use arollForwardTo(...)method– skaffman
Oct 28 '09 at 10:00
@skaffman See my generic rollForward answer. Its not super duper tested but seems to work for me.
– Adam Gent
Jul 18 '12 at 3:02
1
Actually, java.time is not necessarily better that Joda-Time. Each has features the other lacks. For example, java.time lacks the
Intervalclass found in Joda-Time. So use each for its strengths. You can mix and match within a project. Just be careful with yourimportstatements as a few of their classes share the same name.– Basil Bourque
Apr 18 '15 at 19:38