DH family is very big on remembering birthdays and anniversarys and when we got married his dad sent me an excel spreadsheet with everybody's birthday and anniversarys listed so i could remember to send them a card and/or gift. This is very different than how my family opperates. We're much more lax about birthdays and usually just give each other a call on the day unless it's a mile marker birthday or anniversary. So it's no big deal if I am off a day or so.
Trying to be a good daughter-in-law I started making monthly calendars with everyone's birthday and anniversary for the month listed. This month I messed up. DH's mom turns 50 this month, I put it down on the calendar as today. I called her to wish her a happy birthday and we chit chatted for a bit. I talked to DH later and let him know and he tells me his mom's birthday isn't until tomorrow. Now I'm so embarrassed and feel so bad. And I can't believe he didn't mention it earlier that I had the wrong date on the calendar. Ugh, this is just sooo like me!
On a brighter note, DH comes back in 2 days! Yay!