How to get first date of the week based on week number and year in Moment.js?

I tried to get the start date of a specific week in Moment.js from the week number and year by doing moment().year(...).isoWeek(...).startOf('isoWeek')

But It seems that this function is not always returning the correct date.
For example when I live in England and a week always starts on a monday.
We should get 31 Dec 2018 when we ask for the first day of week 1, 2019.

This wasn't the case on 31 Dec 2018 as the result I received was 30 Dec 2019 as the begin date of week 1, 2019. See example

edited Jan 10 at 11:27

asked Jan 2 at 14:07

Logan_Dupont

335

add a comment |

I tried to get the start date of a specific week in Moment.js from the week number and year by doing moment().year(...).isoWeek(...).startOf('isoWeek')

This wasn't the case on 31 Dec 2018 as the result I received was 30 Dec 2019 as the begin date of week 1, 2019. See example

edited Jan 10 at 11:27

asked Jan 2 at 14:07

Logan_Dupont

335

add a comment |

I tried to get the start date of a specific week in Moment.js from the week number and year by doing moment().year(...).isoWeek(...).startOf('isoWeek')

This wasn't the case on 31 Dec 2018 as the result I received was 30 Dec 2019 as the begin date of week 1, 2019. See example

edited Jan 10 at 11:27

asked Jan 2 at 14:07

Logan_Dupont

335

I tried to get the start date of a specific week in Moment.js from the week number and year by doing moment().year(...).isoWeek(...).startOf('isoWeek')

This wasn't the case on 31 Dec 2018 as the result I received was 30 Dec 2019 as the begin date of week 1, 2019. See example

momentjs

edited Jan 10 at 11:27

asked Jan 2 at 14:07

Logan_Dupont

335

edited Jan 10 at 11:27

asked Jan 2 at 14:07

Logan_Dupont

335

edited Jan 10 at 11:27

asked Jan 2 at 14:07

Logan_Dupont

335

asked Jan 2 at 14:07

Logan_Dupont

335

asked Jan 2 at 14:07

Logan_Dupont

335

add a comment |

2 Answers
2

active

oldest

votes

Please note that, as i18n section of the docs states:

By default, Moment.js comes with English (United States) locale strings. If you need other locales, you can load them into Moment.js for later use.

So if you want to use en-gb locale you have explicitly load it (in the browser, you can use en-gb.js file or moment-with-locales.js and then set locale using moment.locale('en-gb')).

You don't have to use year() setter, because it sets the year to 2019 and moment().year(2019).isoWeek(1) gives you the first isoweek of the 2020. You can create a moment object for a given year using moment({y: year}) instead.

You have to use week() instead of isoWeek if you want locale dependent results:

Because different locales define week of year numbering differently, Moment.js added moment#week to get/set the localized week of the year.

The week of the year varies depending on which day is the first day of the week (Sunday, Monday, etc), and which week is the first week of the year.

Here a full code sample:

// Set locale to British English

moment.locale('en-gb');

var year = 2019;

var firstMonday = moment({y: year}) // get first day of the given year

    .week(1) // get the first week according locale

    .startOf('week'); // get the first day of the week according locale

// Show result

console.log(firstMonday.format());

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment-with-locales.min.js"></script>

You can use format() to display the value of a moment object.

answered Jan 2 at 15:36

VincenzoC

16k83957

I was aware that I had to use locale and set it to the correct location. But I wasn't able to get it working in my snippet.

– Logan_Dupont
Jan 10 at 11:49

For week and year I wanted to use the global numbering as later on we will have different locations in our project. That's why i need to use the isoWeek and isoWeekYear.

– Logan_Dupont
Jan 10 at 13:01

add a comment |

I think I found the solution I was looking for

moment() .isoWeekYear(year) .isoWeek(week) .startOf('week')

answered Jan 10 at 11:35

Logan_Dupont

335

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

Please note that, as i18n section of the docs states:

By default, Moment.js comes with English (United States) locale strings. If you need other locales, you can load them into Moment.js for later use.

So if you want to use en-gb locale you have explicitly load it (in the browser, you can use en-gb.js file or moment-with-locales.js and then set locale using moment.locale('en-gb')).

You have to use week() instead of isoWeek if you want locale dependent results:

Because different locales define week of year numbering differently, Moment.js added moment#week to get/set the localized week of the year.

The week of the year varies depending on which day is the first day of the week (Sunday, Monday, etc), and which week is the first week of the year.

Here a full code sample:

// Set locale to British English

moment.locale('en-gb');

var year = 2019;

var firstMonday = moment({y: year}) // get first day of the given year

    .week(1) // get the first week according locale

    .startOf('week'); // get the first day of the week according locale

// Show result

console.log(firstMonday.format());

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment-with-locales.min.js"></script>

You can use format() to display the value of a moment object.

answered Jan 2 at 15:36

VincenzoC

16k83957

I was aware that I had to use locale and set it to the correct location. But I wasn't able to get it working in my snippet.

– Logan_Dupont
Jan 10 at 11:49

For week and year I wanted to use the global numbering as later on we will have different locations in our project. That's why i need to use the isoWeek and isoWeekYear.

– Logan_Dupont
Jan 10 at 13:01

add a comment |

Please note that, as i18n section of the docs states:

By default, Moment.js comes with English (United States) locale strings. If you need other locales, you can load them into Moment.js for later use.

So if you want to use en-gb locale you have explicitly load it (in the browser, you can use en-gb.js file or moment-with-locales.js and then set locale using moment.locale('en-gb')).

You have to use week() instead of isoWeek if you want locale dependent results:

Because different locales define week of year numbering differently, Moment.js added moment#week to get/set the localized week of the year.

The week of the year varies depending on which day is the first day of the week (Sunday, Monday, etc), and which week is the first week of the year.

Here a full code sample:

// Set locale to British English

moment.locale('en-gb');

var year = 2019;

var firstMonday = moment({y: year}) // get first day of the given year

    .week(1) // get the first week according locale

    .startOf('week'); // get the first day of the week according locale

// Show result

console.log(firstMonday.format());

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment-with-locales.min.js"></script>

You can use format() to display the value of a moment object.

answered Jan 2 at 15:36

VincenzoC

16k83957

I was aware that I had to use locale and set it to the correct location. But I wasn't able to get it working in my snippet.

– Logan_Dupont
Jan 10 at 11:49

For week and year I wanted to use the global numbering as later on we will have different locations in our project. That's why i need to use the isoWeek and isoWeekYear.

– Logan_Dupont
Jan 10 at 13:01

add a comment |

Please note that, as i18n section of the docs states:

By default, Moment.js comes with English (United States) locale strings. If you need other locales, you can load them into Moment.js for later use.

So if you want to use en-gb locale you have explicitly load it (in the browser, you can use en-gb.js file or moment-with-locales.js and then set locale using moment.locale('en-gb')).

You have to use week() instead of isoWeek if you want locale dependent results:

Because different locales define week of year numbering differently, Moment.js added moment#week to get/set the localized week of the year.

The week of the year varies depending on which day is the first day of the week (Sunday, Monday, etc), and which week is the first week of the year.

Here a full code sample:

// Set locale to British English

moment.locale('en-gb');

var year = 2019;

var firstMonday = moment({y: year}) // get first day of the given year

    .week(1) // get the first week according locale

    .startOf('week'); // get the first day of the week according locale

// Show result

console.log(firstMonday.format());

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment-with-locales.min.js"></script>

You can use format() to display the value of a moment object.

answered Jan 2 at 15:36

VincenzoC

16k83957

Please note that, as i18n section of the docs states:

By default, Moment.js comes with English (United States) locale strings. If you need other locales, you can load them into Moment.js for later use.

So if you want to use en-gb locale you have explicitly load it (in the browser, you can use en-gb.js file or moment-with-locales.js and then set locale using moment.locale('en-gb')).

You have to use week() instead of isoWeek if you want locale dependent results:

Because different locales define week of year numbering differently, Moment.js added moment#week to get/set the localized week of the year.

The week of the year varies depending on which day is the first day of the week (Sunday, Monday, etc), and which week is the first week of the year.

Here a full code sample:

// Set locale to British English

moment.locale('en-gb');

var year = 2019;

var firstMonday = moment({y: year}) // get first day of the given year

    .week(1) // get the first week according locale

    .startOf('week'); // get the first day of the week according locale

// Show result

console.log(firstMonday.format());

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment-with-locales.min.js"></script>

You can use format() to display the value of a moment object.

// Set locale to British English

moment.locale('en-gb');

var year = 2019;

var firstMonday = moment({y: year}) // get first day of the given year

    .week(1) // get the first week according locale

    .startOf('week'); // get the first day of the week according locale

// Show result

console.log(firstMonday.format());

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment-with-locales.min.js"></script>

// Set locale to British English

moment.locale('en-gb');

var year = 2019;

var firstMonday = moment({y: year}) // get first day of the given year

    .week(1) // get the first week according locale

    .startOf('week'); // get the first day of the week according locale

// Show result

console.log(firstMonday.format());

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment-with-locales.min.js"></script>

answered Jan 2 at 15:36

VincenzoC

16k83957

answered Jan 2 at 15:36

VincenzoC

16k83957

answered Jan 2 at 15:36

VincenzoC

16k83957

answered Jan 2 at 15:36

VincenzoC

16k83957

I was aware that I had to use locale and set it to the correct location. But I wasn't able to get it working in my snippet.

– Logan_Dupont
Jan 10 at 11:49

For week and year I wanted to use the global numbering as later on we will have different locations in our project. That's why i need to use the isoWeek and isoWeekYear.

– Logan_Dupont
Jan 10 at 13:01

add a comment |

I was aware that I had to use locale and set it to the correct location. But I wasn't able to get it working in my snippet.

– Logan_Dupont
Jan 10 at 11:49

For week and year I wanted to use the global numbering as later on we will have different locations in our project. That's why i need to use the isoWeek and isoWeekYear.

– Logan_Dupont
Jan 10 at 13:01

I was aware that I had to use locale and set it to the correct location. But I wasn't able to get it working in my snippet.

– Logan_Dupont
Jan 10 at 11:49

For week and year I wanted to use the global numbering as later on we will have different locations in our project. That's why i need to use the isoWeek and isoWeekYear.

– Logan_Dupont
Jan 10 at 13:01

add a comment |

I think I found the solution I was looking for

moment() .isoWeekYear(year) .isoWeek(week) .startOf('week')

answered Jan 10 at 11:35

Logan_Dupont

335

add a comment |

I think I found the solution I was looking for

moment() .isoWeekYear(year) .isoWeek(week) .startOf('week')

answered Jan 10 at 11:35

Logan_Dupont

335

add a comment |

I think I found the solution I was looking for

moment() .isoWeekYear(year) .isoWeek(week) .startOf('week')

answered Jan 10 at 11:35

Logan_Dupont

335

I think I found the solution I was looking for

moment() .isoWeekYear(year) .isoWeek(week) .startOf('week')

answered Jan 10 at 11:35

Logan_Dupont

335

answered Jan 10 at 11:35

Logan_Dupont

335

answered Jan 10 at 11:35

Logan_Dupont

335

answered Jan 10 at 11:35

Logan_Dupont

335

add a comment |

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