validators.py 文件源码

def date_is_past(value):
    if isinstance(value, datetime.date):
        if value >= datetime.date.today():
            raise ValidationError(
                _("The date entered must be today or lesser.")
            )
    elif isinstance(value, datetime.datetime):
        if value.date() >= datetime.datetime.today():
            raise ValidationError(
                _("The date entered must be lesser than today.")
            )
    else:
        raise ValidationError(
            _("The value entered isn't a valid type of date or datetime.")
        )