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The original was posted on /r/tifu by /u/vajhar on 2025-11-21 16:21:10+00:00.
Not actually today but roughly two years ago my (now) wife and I were finalizing our marriage plans and finally setting a date for the marriage. After some back and forth we figured it would be fun to marry on a Friday the 13th if such a date was available. She has long lived in a house numbered 13 and claimed 13 to be her lucky number, so I thought it to be funny to pick the "cursed" date as our joint lucky day. We wanted to marry in the late summer of 2024 and as luck would have it, the 13th of September happend to be a Friday. She quickly checked her calendar which had nothing marked for that date and asked me, if I knew of any fixed plans for September 13th. Now I didn't use to keep a detailed calendar, and since she already checked for joint plans I couldn't think of anything important happening in the summer and told her it would be free.
Right there was my first mistake: I didn't even pick up a calendar and just checked in my mind for anything happening in September. Which in my mind had to be the seventh month since septa = 7. No I didn't count the months. I just went of my intuition.
But with nothing knowingly planned we confirmed the date, booked the location and caterer and continued planning.
A few weeks later my wife and I were invited to a family getaway with my side of the family. Just a fun weekend in the Belgian countryside hiking and playing games with my family which would be the perfect opportunity to announce our plans and hand out the STDs, which my wife designed herself and was rightfully very proud of. During that design process I again missed the chance to spot my Error, only looking over the cards and praising her choices, not double checking the date because of course my wife wouldn't pick the wrong date.
My family was confused, but slightly amused. Why out of all the available date would we pick this specific one? Guessing the confusion stemming from the odd day selection I explained our reasoning which found acceptance, until my mom had an important detail to add: "Also it's my birthday, so I'm getting a daughter in law as a birthday present."
My wife was rightfully shocked, while I tried to double down, saying my mothers birthday was on 13.09. (Much to the amusement of my family), and learned, that September was indeed the 9th month of our calendar year.
After some further confirmation we established my mother had no problem with putting her birthday in the shadow of our wedding and was happy for us to pick such a special date.
TL;DR: Planning my wedding on September 13th, thinking about 13.07., but my mothers birthday being on 13.09.