timezone.py 文件源码

def make_aware(value, timezone=None, is_dst=None):
    """
    Makes a naive datetime.datetime in a given time zone aware.
    """
    if timezone is None:
        timezone = get_current_timezone()
    if hasattr(timezone, 'localize'):
        # This method is available for pytz time zones.
        return timezone.localize(value, is_dst=is_dst)
    else:
        # Check that we won't overwrite the timezone of an aware datetime.
        if is_aware(value):
            raise ValueError(
                "make_aware expects a naive datetime, got %s" % value)
        # This may be wrong around DST changes!
        return value.replace(tzinfo=timezone)