Well, it was always on the 12th of...
4 seconds sound clip from the Desk Set (1957) movie soundboard.
You can hear this line at 00:23:46 in the Blu-ray version of the movie.
Quote context
[...]
- Coffee break. Better hurry if we want to get a seat.
- Save a seat for me. I'll be right down.
- Oh, he asked me! Finally, he asked me!
- Oh, Bunny! Bunny, I'm so glad!
- Well, it was always on the 12th of...
- What wedding? He invited me to the dance.
- For heaven's sake, what'd you expect me to think?
[...]