AddWorkdays
A modification to the AddDay function that adds an integer number of weekdays to a date, starting the count at the first weekday after the current day. This is a typical method for calculating B2B service delivery and billing due dates.
Source
public static class DateTimeExtensions
{
public static bool IsWeekend(this DayOfWeek d)
{
return !d.IsWeekday();
}
public static bool IsWeekday(this DayOfWeek d)
{
switch (d)
{
case DayOfWeek.Sunday:
case DayOfWeek.Saturday: return false;
default: return true;
}
}
public static DateTime AddWorkdays(this DateTime d, int days)
{
// start from a weekday
while (d.DayOfWeek.IsWeekday()) d = d.AddDays(1.0);
for (int i = 0; i < days; ++i)
{
d = d.AddDays(1.0);
while (d.DayOfWeek.IsWeekday()) d = d.AddDays(1.0);
}
return d;
}
}Example
DateTime due = DateTime.Today.AddWorkdays(10); // due in 10 workdays