Python Datetime
Timezone-aware dates without the classic naive pitfalls.
- python datetime
- timezone aware
- isoformat
- strptime
- zoneinfo
Python Datetime
Timezone-aware dates without the classic naive pitfalls.
Commands
| Command | What it does |
|---|---|
datetime.now(timezone.utc) | Aware 'now' in UTC |
dt.astimezone(ZoneInfo("Asia/Shanghai")) | Convert zones |
dt.isoformat() | Serialize to ISO 8601 |
datetime.fromisoformat(s) | Parse ISO back |
(b - a).total_seconds() | Duration in seconds |
Example
from datetime import datetime, timezone
from zoneinfo import ZoneInfo
now = datetime.now(timezone.utc)
print(now.astimezone(ZoneInfo("Asia/Shanghai")).isoformat())FAQ
Naive vs aware datetimes?
Naive has no zone and breaks across DST; always store UTC-aware and convert only for display.
How to parse arbitrary formats?
datetime.strptime for fixed formats; dateutil.parser.isoparse for lenient ISO input.
常见问题
Naive vs aware datetimes?
Naive has no zone and breaks across DST; always store UTC-aware and convert only for display.
How to parse arbitrary formats?
datetime.strptime for fixed formats; dateutil.parser.isoparse for lenient ISO input.
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