CODEWITHSUNDEEP
c#asp.net
Vivekh
Vivekh

Reputation: 4259

How to find End date from the given date and days excluding sundays

I have my start date as 05/03/2012 and duration is 200 days now I would like to get the end date excluding sundays. So that my end date should be 05/02/2013.. Can some one help me

Upvotes: 3

Views: 873

Answers (2)

Mike Perrenoud
Mike Perrenoud

Reputation: 67948

Try this for me:

var startDate = new DateTime(2012, 5, 3);
var sundaysOverDuration = 200 / 7;
var actualDuration = 200 + sundaysOverDuration;
var newDate = startDate.AddDays(actualDuration);

I also honestly have to admit that this link is flat out elegant surrounding how it handles a lot of the exceptions that exist when doing these types of calculations. I'm not sure you need something that complex, but it's worth letting you know. I'm going to inline the code just to ensure it's preserved if the link is ever broken.

public static double GetBusinessDays(DateTime startD, DateTime endD) 
{
    double calcBusinessDays =
        1 + ((endD-startD).TotalDays * 6 -
        (startD.DayOfWeek-endD.DayOfWeek) * 2) / 7;
    if ((int)startD.DayOfWeek == 0) calcBusinessDays --;
    return calcBusinessDays;
}

public static DateTime AddWorkDaysToStartDate(DateTime startD, double businessDays)
{
    int DoW = (int)startD.DayOfWeek;
    double temp = businessDays + DoW + 1;
    if (DoW != 0) temp --;
    DateTime calcendD = startD.AddDays(
    Math.Floor(temp / 6)*2-DoW + temp
        - 2* Convert.ToInt32(temp % 6 == 0)) ;
}

Finally, based on your question it doesn't appear you need to handle holidays, but if you do the solution is much more complex and would need to be database driven, so just keep that in mind.

Upvotes: 1

user687474
user687474

Reputation:

You can use the CalendarDateAdd class from the Time Period Library for .NET:

// ----------------------------------------------------------------------
public void AddDaysSample()
{
    CalendarDateAdd calendarDateAdd = new CalendarDateAdd();
    calendarDateAdd.AddWorkingWeekDays();
    calendarDateAdd.WeekDays.Add( DayOfWeek.Saturday );

    DateTime start = new DateTime( 2012, 5, 3 );
    TimeSpan duration = new TimeSpan( 200, 0, 0, 0 );
    DateTime? end = calendarDateAdd.Add( start, duration );
    Console.WriteLine( "AddDaysSample : {0:d} + {1} days = {2:d}", start, duration.Days, end );
} // AddDaysSample

Upvotes: 0

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