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				# Copyright (C) 2020-2021 The Software Heritage developers
				# See the AUTHORS file at the top-level directory of this distribution
				# License: GNU General Public License version 3, or any later version
				# See top-level LICENSE file for more information

				from datetime import datetime, timezone
				from typing import Optional, Union

				import dateutil


				def parse_visit_date(visit_date: Optional[Union[datetime, str]]) -> Optional[datetime]:
				"""Convert visit date from either None, a string or a datetime to either None or
				datetime.

				"""
				if visit_date is None:
				return None

				if isinstance(visit_date, datetime):
				return visit_date

				if visit_date == "now":
				return datetime.now(tz=timezone.utc)

				if isinstance(visit_date, str):
				return dateutil.parser.parse(visit_date)

				return ValueError(f"invalid visit date {visit_date!r}")
				ardumontAuthorUnsubmitted Done Inline Actions should raise here ¯\_(ツ)_/¯ ardumont: should raise here ¯\_(ツ)_/¯