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postgresql: Fix one-by-one error in db_to_date on negative dates

vlorentz requested to merge generated-differential-D6815-source into generated-differential-D6815-target

Using int() on date.timestamp() rounded it up (toward zero), but the semantics of model.Timestamp is that the actual time is ts.seconds + ts.microseconds/1000000, so all negative dates were shifted one second up.

In particular, this causes dates from 1969-12-31T23:59:59.000001 to 1969-12-31T23:59:59.999999 (inclusive) to smash into dates from 1970-01-01T00:00:00.000001 to 1970-01-01T00:00:00.999999, which is how I discovered the issue.

Depends on !749 (closed).

Migrated from D6815 (view on Phabricator)

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