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

[Brian Curtin]

Brian Curtin <curtin at acm.org> added the comment:

Using time.daylight is incorrect. time.daylight specifies the number of hours that the daylight offset is, not a flag to specify whether or not daylight savings time is in effect.

Steven's suggestion of using time.localtime().tm_isdst seems to be the better route.

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priority:  -> normal
stage:  -> patch review

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