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BUG: inconsistent handling of exact=False case in to_datetime parsing #50412

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@jorisvandenbossche

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@jorisvandenbossche

From #50411 (comment)

The documentation of to_datetime says:

exact : bool, default True
Control how format is used:

  • If :const:True, require an exact format match.
  • If :const:False, allow the format to match anywhere in the target string.

Based on that, I would expect we don't use anything else in the string that doesn't match the format. But it seems this currently depends on the exact format being used:

>>> pd.to_datetime(["19/may/11 01:00:00"], format="%d/%b/%y", exact=False)
DatetimeIndex(['2011-05-19'], dtype='datetime64[ns]', freq=None)

>>> pd.to_datetime(["2011-05-19 01:00:00"], format="%Y-%m-%d", exact=False)
DatetimeIndex(['2011-05-19 01:00:00'], dtype='datetime64[ns]', freq=None)

(happens both on current main and on 1.5)

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