Adding Days to a Date but Excluding Weekends

Question

Given a date how can I add a number of days to it, but exclude weekends. For example, given 11/12/2008 (Wednesday) and adding five will result in 11/19/2008 (Wednesday) rath

Answer 1

Given the number of the original day in the year D and original day in the week W and the number of workdays to add N, the next weekday number is

W + N % 5.

The next day in the year (with no wraparound check) is

D + ((N / 5) * 7) + N % 5).

This is assuming that you have integer division.