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Ran 11 Nov 2022 11:38AM UTC

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Committed 11 Nov 2022 11:38AM UTC coverage: 93.327% (+0.2%) from 93.142%

Job # #37333.1

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Commit Message

Dates: Error on construction/parsing with empty strings (#47117)

When attempting to construct a `DateTime`, `Date` or `Time` from an
`AbstractString`, throw an `ArgumentError` if the string is empty.
Likewise, error when `parse`ing an empty string as one of these types,
and return `nothing` from `tryparse`.

This behavior differs from previously.  Before, `Date` and `Time` would
return default values of `Date(1)` and `Time(0)`, respectively, while
`DateTime` would error without a `format` argument.  With a `format`
argument, it would return `DateTime(1)`.  However, this appears not to
have been explicitly intended, but rather a consequence of the way
parsing was implemented; no tests for empty string parsing existed.

This addresses #28090 and #43883; see discussion therein.

Summary of changes:
- Check for empty string in `Base.parse(::DateTime)` and throw if so.
- Change documentation to mention this.
- Add a compat notice to the docs contrasting the old behavior.

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