BUG: inferred Timestamp unit with dateutil paths · Issue #55737 · pandas-dev/pandas (original) (raw)

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Description

pd.Timestamp("10/27/23 14:19:01.000").unit 's'

pd.Timestamp("01-01-2013T00:00:00.000000000+0000").unit 's'

In dateutil_parse we have

    if reso == "microsecond":
        if repl["microsecond"] == 0:
            reso = "second"
        elif repl["microsecond"] % 1000 == 0:
            reso = "millisecond"

which ends up ignoring the trailing zeros. We end up with an incorrectly low-resolution unit.

Surfaced while implementing #55564.