• src/sbbs3/logon.cpp userd

    From Rob Swindell (on Windows@VERT to Git commit to main/sbbs/m on Friday, January 02, 2026 21:02:00
    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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