Fix how zero Date/DateTimes look to other formulas #1995
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Context
The date 1970-01-01 is incorrectly cast as a float in formula columns. See #1994 for more details.
Resoves #1994
Proposed solution
Date/DateTime values are stored as floats. To check if it should be presented as a date/datetime object, we should check if we have a float rather than if the value is truthy (as that incorrectly interprets zeros as non-dates).
Has this been tested?