What Excel formula can I use to calculate the 2nd Monday of a given month?
Here's something I found with a quick search:
Generically you can get the nth xday of the month with this formula
=DATE(B2,A2,1+7*n)-WEEKDAY(DATE(B2,A2,8-xday))
where year is in B2 and month (as a number 1 to 12) is in A2, and where xday is a number representing the day of the week (1 = Sun through to 7 = Sat), so for 1st Saturday that becomes
=DATE(B2,A2,1+7*1)-WEEKDAY(DATE(B2,A2,8-7))
or for 4th Thursday
=DATE(B2,A2,1+7*4)-WEEKDAY(DATE(B2,A2,8-5))
So, if I'm reading this properly, the 2nd Monday of the month is
=DATE(B2,A2,1+7*2)-WEEKDAY(DATE(B2,A2,8-2))
(credit where credit is due)