[issue7582] [patch] diff.py to use iso timestamp

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

The latest patch will produce wrong results if the file was last modified before timezone rules changed in your location.  See issue1647654.

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assignee:  -> belopolsky
dependencies: +No obvious and correct way to get the time zone offset

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<http://bugs.python.org/issue7582>
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