pg.py 文件源码

def cast_date(value, connection):
    """Cast a date value."""
    # The output format depends on the server setting DateStyle.  The default
    # setting ISO and the setting for German are actually unambiguous.  The
    # order of days and months in the other two settings is however ambiguous,
    # so at least here we need to consult the setting to properly parse values.
    if value == '-infinity':
        return date.min
    if value == 'infinity':
        return date.max
    value = value.split()
    if value[-1] == 'BC':
        return date.min
    value = value[0]
    if len(value) > 10:
        return date.max
    fmt = connection.date_format()
    return datetime.strptime(value, fmt).date()