Serhiy Storchaka added the comment:
If call time.localtime() with time before 1990-03-25T03:00, EET is turned to
MSK. I guess this is a time when the Europe/Kiev timezone was introduced.
>>> import os, time
>>> os.environ['TZ'] = 'Europe/Kiev'
>>> time.tzset()
>>> time.localtime(638319599)
time.struct_time(tm_year=1990, tm_mon=3, tm_mday=25, tm_hour=1, tm_min=59,
tm_sec=59, tm_wday=6, tm_yday=84, tm_isdst=0)
>>> time.strftime('%Z', time.gmtime())
'MSK'
>>> time.localtime(638319600)
time.struct_time(tm_year=1990, tm_mon=3, tm_mday=25, tm_hour=3, tm_min=0,
tm_sec=0, tm_wday=6, tm_yday=84, tm_isdst=1)
>>> time.strftime('%Z', time.gmtime())
'EET'
C function localtime() implicitly calls tzset() and sets global C variables
tzname, timezone, and daylight, but these changes are not exposed as variables
in the time module. C and Python ideas about timezone becomes different. This
looks as a bug in time.localtime() and other functions that implicitly change
timezone variables.
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<http://bugs.python.org/issue22067>
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