[issue44986] Date formats in help messages of argparse

[Matías Senger]

Matías Senger <mail.de.senger at gmail.com> added the comment:

With this change there should be no need to escape anything, and it is still compatible with the old formatting. Plus, with the current implementation if you forget to escape something like %Y the error message is not helpful at all and only happens when invoked with -h option.

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<https://bugs.python.org/issue44986>
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