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"""tzlocal for OS X."""
import os
import dateutil.tz
import subprocess
_cache_tz = None
def _get_localzone():
tzname = subprocess.check_output(["systemsetup", "-gettimezone"]).decode('utf-8')
tzname = tzname.replace("Time Zone: ", "")
# OS X 10.9+, this command is root-only
if 'exiting!' in tzname:
tzname = ''
if not tzname:
# link will be something like /usr/share/zoneinfo/America/Los_Angeles.
link = os.readlink("/etc/localtime")
tzname = link.split('zoneinfo/')[-1]
tzname = tzname.strip()
try:
# test the name
assert tzname
dateutil.tz.gettz(tzname)
return tzname
except:
return None
def get_localzone():
"""Get the computers configured local timezone, if any."""
global _cache_tz
if _cache_tz is None:
_cache_tz = _get_localzone()
return _cache_tz
def reload_localzone():
"""Reload the cached localzone. You need to call this if the timezone has changed."""
global _cache_tz
_cache_tz = _get_localzone()
return _cache_tz
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