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Posted By

chadj2 on 02/20/09


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day DateTime Business


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flurk118
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Method for adding working days to a date

 / Published in: C#
 

A quick search on the internet reveals all kinds of ways you can calculate with business days. I think is the most simple and efficient. In this example add day of week and weeks separately. The loop is never iterated more then 4 times regardless of the number of days being added.

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Posted By: MLaritz on March 4, 2010

You can simplify this by not using nWeekDay and just using nDays. I created an extension method:

public static class DateTimeExtensions
{
    public static DateTime AddBusinessDays(this DateTime date, int days)
    {
        int direction = days < 0 ? -1 : 1;

        while(days != 0)
        {
            date.AddDays(direction);
            if(date.DayOfWeek != DayOfWeek.Saturday && date.DayOfWeek != DayOfWeek.Sunday)
            {
                days -= direction;
            }
        }

        return date;
    }
}
Posted By: ybastiand on July 2, 2010

There is a bug in comment from MLaritz, at least when I change the method to be non extension. Fix is to assign the result of date.AddDays back in the date variable.

Here is my solution (unit tested): /// /// Add or remove some business days to a date time. /// /// /// /// public static DateTime AddBusinessDays(DateTime date, int days) { int direction = (days < 0) ? -1 : 1;

        while (days != 0)
        {
            date = date.AddDays(direction);
            if (date.DayOfWeek != DayOfWeek.Saturday && date.DayOfWeek != DayOfWeek.Sunday)
            {
                days -= direction;
            }
        }

        return date;
    }
Posted By: ybastiand on July 2, 2010

There is a bug in comment from MLaritz, at least when I change the method to be non extension. Fix is to assign the result of date.AddDays back in the date variable.

Here is my solution (unit tested): /// /// Add or remove some business days to a date time. /// /// /// /// public static DateTime AddBusinessDays(DateTime date, int days) { int direction = (days < 0) ? -1 : 1;

        while (days != 0)
        {
            date = date.AddDays(direction);
            if (date.DayOfWeek != DayOfWeek.Saturday && date.DayOfWeek != DayOfWeek.Sunday)
            {
                days -= direction;
            }
        }

        return date;
    }

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