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# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# --------------------------------------------------------------------------
from datetime import datetime, timezone
from typing import Optional
EPOCH_AS_FILETIME = 116444736000000000 # January 1, 1970 as MS filetime
HUNDREDS_OF_NANOSECONDS = 10000000
def _to_utc_datetime(value: datetime) -> str:
return value.strftime('%Y-%m-%dT%H:%M:%SZ')
def _rfc_1123_to_datetime(rfc_1123: str) -> Optional[datetime]:
"""Converts an RFC 1123 date string to a UTC datetime.
:param str rfc_1123: The time and date in RFC 1123 format.
:returns: The time and date in UTC datetime format.
:rtype: datetime
"""
if not rfc_1123:
return None
return datetime.strptime(rfc_1123, "%a, %d %b %Y %H:%M:%S %Z")
def _filetime_to_datetime(filetime: str) -> Optional[datetime]:
"""Converts an MS filetime string to a UTC datetime. "0" indicates None.
If parsing MS Filetime fails, tries RFC 1123 as backup.
:param str filetime: The time and date in MS filetime format.
:returns: The time and date in UTC datetime format.
:rtype: datetime
"""
if not filetime:
return None
# Try to convert to MS Filetime
try:
temp_filetime = int(filetime)
if temp_filetime == 0:
return None
return datetime.fromtimestamp((temp_filetime - EPOCH_AS_FILETIME) / HUNDREDS_OF_NANOSECONDS, tz=timezone.utc)
except ValueError:
pass
# Try RFC 1123 as backup
return _rfc_1123_to_datetime(filetime)
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