Merge pull request #3752 from phproberto/back-login

[fix] Missing comma in #3677 breaks backend login
[fix][#33773] dates for SQL Server. Fixes 3576

1032 removed ','
1034 replaced nulldate with '1900-01-01'

nulldate -> 1970-01-01

Null date > 1900-01-01 for mssql/azure