Class TZWinContext

tests/_common.py:136–162

Context manager for changing local time zone on Windows. Because the effect of this is system-wide and global, it may have unintended side effect. Set the ``DATEUTIL_MAY_CHANGE_TZ`` environment variable to a truthy value before using this context manager.

class TZWinContext(TZContextBase):
    """
    Context manager for changing local time zone on Windows.

    Because the effect of this is system-wide and global, it may have
    unintended side effect. Set the ``DATEUTIL_MAY_CHANGE_TZ`` environment
    variable to a truthy value before using this context manager.
    """
    def get_current_tz(self):
        p = subprocess.Popen(['tzutil', '/g'], stdout=subprocess.PIPE)

        ctzname, err = p.communicate()
        ctzname = ctzname.decode()     # Popen returns

        if p.returncode:
            raise OSError('Failed to get current time zone: ' + err)

        return ctzname

    def set_current_tz(self, tzname):
        p = subprocess.Popen('tzutil /s "' + tzname + '"')

        out, err = p.communicate()

        if p.returncode:
            raise OSError('Failed to set current time zone: ' +
                          (err or 'Unknown error.'))


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