week-number

问题 Date is datetime.date(2013, 12, 30) I am trying to get week number using import datetime datetime.date(2013, 12, 30).isocalendar()[1] I am getting output as , 1 Why i am not getting week number of last year , instead i am getting week number of current year? Whats wrong i am doing here ? 回答1: You are doing nothing wrong, 2013/12/30 falls in week 1 of 2014, according to the ISO8601 week numbering standard: The ISO 8601 definition for week 01 is the week with the year's first Thursday in it.

问题 This question already has answers here : Calculate week of month in .NET (12 answers) Closed 5 years ago . I want to find a date are now on week number with c# desktop Application. I've been looking on google, but none that fit my needs. How do I get a week in a month as the example below? Example: I want January 6, 2014 = the first week of January January 30, 2014 = fourth week of January but 1 February 2014 = week 4 in January and 3 February 2014 was the first week in February 回答1: Here is

问题 In Entity Framework 6 I can use SqlFunctions.DatePart() method: var byWeek = data.GroupBy(x => SqlFunctions.DatePart("week", x.Date)); But these classes ( DbFunctions and SqlFunctions are not available in Entity Framework Core) (reference). So my question is How can I group by week in Entity Framework core? 回答1: My current workaround for the missing functionality is var firstMondayOfYear = this.GetFirstMondayOfYear(DateTime.Now.Year); var entries = this.entitiesService.FindForLastMonths(this

问题 In regular SQL i could do something like SELECT * From T GROUP BY DATEPART(wk, T.Date) How can i do that in Linq to SQL ? The following don't work From F In DB.T Group R By DatePart(DateInterval.WeekOfYear, F.Date) Also don't work: From F In DB.T Group R By (F.Date.DayOfYear / 7) 回答1: Range variable name can be inferred only from a simple or qualified name with no arguments 回答2: LINQ to SQL does not support the Calendar.WeekOfYear method, but you could potentially create a TSQL function that

问题 Can someone kindly explain me why these two give different results? I execute this with PHP. date("YW",mktime(0, 0, 0, 3, 22 , 2013)); // outputs 201312 And when I execute this with MySQL SELECT YEARWEEK(now()); // outputs 201311 回答1: You need to specify mode 3 on the mysql YEARWEEK call: SELECT YEARWEEK(now(),3); The PHP date() placeholder W returns the week number according to the ISO 8601 specification. That means weeks start on Monday (not Sunday), the first week of the year is number 1

问题 How could I get from moment JS the week number from a date in the past only from a moment formatted object from a day selected? 回答1: $(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

问题 How could I get from moment JS the week number from a date in the past only from a moment formatted object from a day selected? 回答1: $(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

问题 I want to create a function in C# which for a week number will return me the days, in that week. For instance for week number 40, how can I get the days: 4/10, 5/10, 6/10, 7/10, 8/10, 9/10, 10/10. Thank you in advance! 回答1: I think this should do what you want: public static DateTime[] WeekDays(int Year, int WeekNumber) { DateTime start = new DateTime(Year, 1, 1).AddDays(7 * WeekNumber); start = start.AddDays(-((int)start.DayOfWeek)); return Enumerable.Range(0, 7).Select(num => start.AddDays

问题 How can I determine the (ISO 8601) week number in a Windows batch file? Unfortunately WMIC PATH WIN32_LOCALTIME GET /FORMAT:LIST only has WeekInMonth ... I have found some very complex solutions. Is there no easier way? 回答1: You can use Ritchie Lawrences's Date Functions. It is maintained on Gitub. https://ritchielawrence.github.io/batchfunctionlibrary/ Here is the code. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: :DateToWeek %yy% %mm% %dd% yn cw dw :: :: By:

问题 I'm in the middle of calculating week numbers for dates, but the System.Globalization.Calendar is returning odd results for (amongst other years) December 31st of year 2007 and 2012. Calendar calendar = CultureInfo.InvariantCulture.Calendar; var date = new DateTime(2007, 12, 29); for (int i = 0; i < 5; i++) { int w = calendar.GetWeekOfYear(date, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday); Console.WriteLine("{0}\t{1}", date.ToString("dd.MM.yyyy"), w); date = date.AddDays(1); }