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46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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import time
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import datetime
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import calendar
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def get_system_offset():
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"""Get system's timezone offset using built-in library time.
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For the Timezone constants (altzone, daylight, timezone, and tzname), the
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value is determined by the timezone rules in effect at module load time or
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the last time tzset() is called and may be incorrect for times in the past.
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To keep compatibility with Windows, we're always importing time module here.
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"""
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localtime = calendar.timegm(time.localtime())
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gmtime = calendar.timegm(time.gmtime())
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offset = gmtime - localtime
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# We could get the localtime and gmtime on either side of a second switch
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# so we check that the difference is less than one minute, because nobody
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# has that small DST differences.
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if abs(offset - time.altzone) < 60:
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return -time.altzone
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else:
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return -time.timezone
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def get_tz_offset(tz):
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"""Get timezone's offset using built-in function datetime.utcoffset()."""
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return int(datetime.datetime.now(tz).utcoffset().total_seconds())
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def assert_tz_offset(tz):
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"""Assert that system's timezone offset equals to the timezone offset found.
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If they don't match, we probably have a misconfiguration, for example, an
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incorrect timezone set in /etc/timezone file in systemd distributions."""
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tz_offset = get_tz_offset(tz)
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system_offset = get_system_offset()
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if tz_offset != system_offset:
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msg = ('Timezone offset does not match system offset: {0} != {1}. '
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'Please, check your config files.').format(
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tz_offset, system_offset
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)
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raise ValueError(msg)
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