TZUTC: -0800
MSGID: 53904.syncprog@1:103/705 2dbeab64
PID: Synchronet 3.21a-Linux master/48922a15c Dec 17 2025 GCC 12.2.0
TID: SBBSecho 3.34-Linux master/8bb133aa7 Dec 30 2025 GCC 12.2.0
BBSID: VERT
CHRS: ASCII 1
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/commit/64973f63dcceb80efe7f5f74
Modified Files:
	src/sbbs3/logon.cpp userdat.c userdat.h
Log Message:
Add/use birthdate_is_valid() function, written by Co-pilot

Function looks good to me - even rejects invalid Feb 29ths!

Fix issue #1041
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