How to display the week number in C# after selecting the from date and to date from the calendar

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how to display the week number dynamically in a drop down after selecting the "fromdate" and "todate" from the calendar popup
I am trying to auto fill the drop down "ddlWeekNo" from fromDate and toDate

Please assist
Thanks in advance

What I have tried:

DateTime fromDate = Convert.ToDateTime(txtFrom.Text);
           DateTime toDate = Convert.ToDateTime(txtTo.Text);
           String WeekFromTo = CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(fromDate.Month).ToString() + " " + fromDate.Day.ToString() + " " + fromDate.Year.ToString() + " to " + CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(toDate.Month).ToString() + " " + toDate.Day.ToString() + " " + toDate.Year.ToString();
           String WeekString = "Week " + ddlWeekNo.SelectedValue + ": " + WeekFromTo;

Posted 27-Sep-17 6:03am

Renjith_R

Updated 28-Jun-18 23:33pm

v3

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Comments

Karthik_Mahalingam 27-Sep-17 23:31pm

what is the issue ?

Richard Deeming 28-Sep-17 12:28pm

String WeekFromTo = CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(fromDate.Month).ToString() + " " + fromDate.Day.ToString() + " " + fromDate.Year.ToString() + " to " + CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(toDate.Month).ToString() + " " + toDate.Day.ToString() + " " + toDate.Year.ToString();

That can be simplified to:

string WeekFromTo = string.Format(CultureInfo.CurrentCulture, "{0:MMMM d yyyy} to {1:MMMM d yyyy}", fromDate, toDate);

Or, if you're using VS2017 / C# 6:

string WeekFromTo = $"{fromDate:MMMM d yyyy} to {toDate:MMMM d yyyy}";

Custom Date and Time Format Strings | Microsoft Docs[^]

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Richard MacCutchan · Answer 1 · 2017-09-27T10:00:00

Solution 1

Week numbers according to ISO8601[^].

Posted 27-Sep-17 10:00am

Richard MacCutchan

Herman<T>.Instance · Answer 2 · 2018-06-28T23:34:00

When displaying year-weeknr in TextBox with TextMode=Week

public class DateHelpers
    {
        /// <summary>
        /// Gets the current week number.
        /// </summary>
        /// <returns></returns>
        public static string GetCurrentWeekNumber()
        {
            var weeknum = Thread.CurrentThread.CurrentCulture.Calendar.GetWeekOfYear(DateTime.Now, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
            return DateTime.Now.ToString($"{DateTime.Now.Year}-W{weeknum}");
        }

        /// <summary>
        /// Gets the current week number for a specified DateTime object.
        /// </summary>
        /// <param name="dateTime">The date time.</param>
        /// <returns></returns>
        public static string GetCurrentWeekNumber(DateTime dateTime)
        {
            var weeknum = Thread.CurrentThread.CurrentCulture.Calendar.GetWeekOfYear(dateTime, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
            return dateTime.ToString($"{dateTime.Year}-W{weeknum}");
        }
    }