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For the record 2201010001 (ie today's date) is greater than the largest 32-bit signed int (while 2112310001 wasn't)

Why on earth do they store it like that?

The codebase is from at least 1996.

This bug could only have been introduced after 2000, because if it can't fit a number beginning with 22 it certainly can't fit one beginning with 96.