The definition of Week of Year is Locale dependent. How it is defined in US is discused in the other posts. For example in Germany (DIN 1355-1 / ISO 8601): the first Week* of Year is the first week with 4 or more days in the new year. *first day of week is Monday and … Read more
In order to use straight division, the day of month for the date you’re looking at needs to be adjusted according to the position (within the week) of the first day of the month. So, if your month happens to start on a Monday (the first day of the week), you can just do division … Read more
One small warning. I haven’t tested this yet, but looking at the API documentation of WeekFields and LocalDate.get, you should do something like: LocalDate date = …; // Or use a specific locale, or configure your own rules WeekFields weekFields = WeekFields.of(Locale.getDefault()); int weekNumber = date.get(weekFields.weekOfWeekBasedYear());
With the isoweek module you can do it with: from isoweek import Week d = Week(2011, 40).monday()
$(document).ready(function(){ var weeknumber = moment(“12-25-1995”, “MM-DD-YYYY”).week(); console.log(weeknumber); }); According momentjs docs: 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 … Read more
Base package Using the function strftime passing the argument %V to obtain the week of the year as decimal number (01–53) as defined in ISO 8601. (More details in the documentarion: ?strftime) strftime(c(“2014-03-16”, “2014-03-17″,”2014-03-18”, “2014-01-01”), format = “%V”) Output: [1] “11” “12” “12” “01”
You can find the day of week and do a date add on days to get the start and end dates.. DATEADD(dd, -(DATEPART(dw, WeddingDate)-1), WeddingDate) [WeekStart] DATEADD(dd, 7-(DATEPART(dw, WeddingDate)), WeddingDate) [WeekEnd] You probably also want to look at stripping off the time from the date as well though.
I had issues with the solution by @HenkHolterman even with the fix by @RobinAndersson. Reading up on the ISO 8601 standard resolves the issue nicely. Use the first Thursday as the target and not Monday. The code below will work for Week 53 of 2009 as well. public static DateTime FirstDateOfWeekISO8601(int year, int weekOfYear) { … Read more