|As far as I can tell, your Custom Format only stores your Date as a Number, |
NOT a real DATE, so all your doing is adding 29 to your number:
Your custom format shows: 04/26/2013
but Excel sees 4262013
so adding 29 simply gets you 4262013 + 29 = 4262042
Why not just use the regular Date formats?
Would make doing Date Math a lot easier.