testland/freezegun-python
Wraps freezegun (github.com/spulec/freezegun), the Python time-mocking library: @freeze_time decorator / context manager, freeze_time(...).start() + stop(), tick / move_to / tz_offset, and integration with datetime.now / time.time / time.localtime. Use when testing Python code that calls datetime / time.
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advanced-scenarios.mdreferences/
freezegun advanced scenarios
DST/zone tests, async support, and CI wiring extracted from the core skill. Core decorator/context-manager/tick usage stays in SKILL.md.
DST + zone tests
tz_offset is a fixed offset and does not know about DST. For
local-zone behaviour at a transition, freeze UTC and read through
zoneinfo.
import pytest
from zoneinfo import ZoneInfo
from freezegun import freeze_time
from datetime import datetime
@freeze_time("2026-03-08T07:30:00") # 02:30 EST OR 03:30 EDT - depends on resolution
def test_spring_forward_handling():
ny = datetime.now(ZoneInfo("America/New_York"))
# Asserts against expected library behaviour per dst-transition-referenceAsync support
from freezegun import freeze_time
from datetime import datetime
import asyncio
@freeze_time("2026-05-20T14:30:00")
async def test_async_now():
await asyncio.sleep(0)
assert datetime.now().strftime("%Y") == "2026"Per freezegun docs: "freezegun is compatible with asyncio."
CI integration
jobs:
python-tests:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v5
- uses: actions/setup-python@v5
- run: pip install -e ".[test]" freezegun
- run: pytest tests/