Custom Date Decoder — Vadim's formula

MM (00–99)

DD (01–99)

YYYY (1900–1999)

Add 1 day Subtract 1 day

Note: only one of Add or Subtract should be checked; they modify the final calculated date by ±1 day.

Optional: include time (00–99 for each)

Hours (00–99)

Minutes (00–99)

Seconds (00–99)

If you give time values, they are added to 00:00:00 of the decoded month/day; overflow beyond 24 hours will increment the date automatically.

Note: Most of the code for this program was generated by ChatGPT. However, I have made some modifications to the code (e.g changing the style, changing the text in "How to Solve").

Note 2: If you want to slightly get a deeper meaning of some of the formula I've created (including some problems I've solved with this weird formula), download this .txt file right here.

Note 3: If, for example you want to get a date on December 1900 (by typing a multiple of 12 into the "MM" value), but keep getting the year wrong (i.e a year added to the one you have selected), then subtract 12 from the "MM" value you've selected.

Last updated: 09/01/2026, 4:25 PM (Latvian time)