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- from datetime import datetime, timezone
- from dateutil import parser
- def parse_iso8601_to_utc(dt_str: str) -> datetime:
- """
- Parse an ISO8601 datetime string (with optional timezone) into a datetime
- object in UTC timezone.
- Handles nanoseconds by truncating to microseconds.
- Args:
- - dt_str: The ISO8601 datetime string to parse.
- Example:
- - UTC with Z: '2025-11-11T04:08:35.882997794Z'
- - With timezone offset: '2025-11-11T12:08:35.882997+08:00'
- - Without timezone (assumed UTC): '2025-11-11T04:08:35.882997'
- """
- dt = parser.isoparse(dt_str)
- if dt.tzinfo is None:
- dt = dt.replace(tzinfo=timezone.utc)
- else:
- dt = dt.astimezone(timezone.utc)
- return dt
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