Calendar Basics in asp.net

For all the examples shown below the System.Globalization namespace should be used. It is a class library containing calender related functions.

Get the DayNames in C#.NET

public string[] GetDayNamesList()

{

        DateTimeFormatInfo dfi = DateTimeFormatInfo.CurrentInfo;

        string[] _months = dfi.MonthNames;

        return _months;

}

Output:

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Get Week Number of the year.

public static int GetWeekNumber(DateTime dtDate)

    {

        CultureInfo ciCurr = CultureInfo.CurrentCulture;

        int weekNum = ciCurr.Calendar.GetWeekOfYear(dtDate, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

        return weekNum;

    }

Output:

49

Get weeks spanned by

private static int getWeeksSpannedBy(DateTime startDate, DateTime endDate)

    {

        var calendar = CultureInfo.CurrentCulture.Calendar;

        var weekRule = CultureInfo.CurrentCulture.DateTimeFormat.CalendarWeekRule;

        var firstDayOfWeek = DayOfWeek.Sunday;

        int lastWeek = calendar.GetWeekOfYear(endDate, weekRule, firstDayOfWeek);

        int firstWeek = calendar.GetWeekOfYear(startDate, weekRule, firstDayOfWeek);

        int weekDiff = lastWeek - firstWeek + 1;

        return weekDiff;

    }

Output:

4