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+# coding=utf-8
+# Copyright 2022-present, the HuggingFace Inc. team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Contains utilities to handle datetimes in Huggingface Hub."""
+
+from datetime import datetime, timezone
+
+
+def parse_datetime(date_string: str) -> datetime:
+ """
+ Parses a date_string returned from the server to a datetime object.
+
+ This parser is a weak-parser is the sense that it handles only a single format of
+ date_string. It is expected that the server format will never change. The
+ implementation depends only on the standard lib to avoid an external dependency
+ (python-dateutil). See full discussion about this decision on PR:
+ https://github.com/huggingface/huggingface_hub/pull/999.
+
+ Example:
+ ```py
+ > parse_datetime('2022-08-19T07:19:38.123Z')
+ datetime.datetime(2022, 8, 19, 7, 19, 38, 123000, tzinfo=timezone.utc)
+ ```
+
+ Args:
+ date_string (`str`):
+ A string representing a datetime returned by the Hub server.
+ String is expected to follow '%Y-%m-%dT%H:%M:%S.%fZ' pattern.
+
+ Returns:
+ A python datetime object.
+
+ Raises:
+ :class:`ValueError`:
+ If `date_string` cannot be parsed.
+ """
+ try:
+ # Normalize the string to always have 6 digits of fractional seconds
+ if date_string.endswith("Z"):
+ # Case 1: No decimal point (e.g., "2024-11-16T00:27:02Z")
+ if "." not in date_string:
+ # No fractional seconds - insert .000000
+ date_string = date_string[:-1] + ".000000Z"
+ # Case 2: Has decimal point (e.g., "2022-08-19T07:19:38.123456789Z")
+ else:
+ # Get the fractional and base parts
+ base, fraction = date_string[:-1].split(".")
+ # fraction[:6] takes first 6 digits and :0<6 pads with zeros if less than 6 digits
+ date_string = f"{base}.{fraction[:6]:0<6}Z"
+
+ return datetime.strptime(date_string, "%Y-%m-%dT%H:%M:%S.%fZ").replace(tzinfo=timezone.utc)
+ except ValueError as e:
+ raise ValueError(
+ f"Cannot parse '{date_string}' as a datetime. Date string is expected to"
+ " follow '%Y-%m-%dT%H:%M:%S.%fZ' pattern."
+ ) from e