New Game -- Game Information window
Setting a negative date for "Starting Year" (say, for example, because one is doing a conventional start and wishes the calendar to count up from the Stardate of First Contact) generates the error:
"Function #1690: Year, Month, and Day parameters describe an un-representable DateTime."
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(VB Aurora had no problem with this, and would happily count forwards from 01 January -22 or -15 or -99 or whatever.)