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Count elapsed time across DST in timesince - #56
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| timezone = ZoneInfo('America/New_York') | ||
| except ZoneInfoNotFoundError: | ||
| pytest.skip('IANA timezone data is not available') | ||
| current = current.replace(tzinfo=timezone) |
wolph
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October 11, 2026 08:36
wolph
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Oct 11, 2026
CodeQL flagged timezone as possibly uninitialised in test_timesince_counts_elapsed_time_across_dst, because it does not know that pytest.skip raises. A skipif mark on the available timezones keeps the same skip without the try block.
Owner
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Thank you for the fix and the thorough tests! DST manages to bite every time library eventually. CodeQL didn't realise that |
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timesincesubtracts the input fromdatetime.now(input.tzinfo). When both share the same changing timezone, Python ignores UTC-offset changes andfold: the two occurrences of2026-11-01 01:30in New York are one hour apart but currently producejust now. Across the spring transition, one elapsed hour can produce2 hours ago.Convert the current aware time to UTC before subtraction so elapsed time includes offset changes. Leave the input in its original timezone to preserve valid
datetime.min/maxvalues whose equivalent UTC dates would overflow. Naive datetime, timedelta and date-error behavior stay the same. Add past/future fall-back and spring-forward regressions, boundary coverage, and a short guide clarification.Validation:
toxpasses on CPython 3.10–3.14 and PyPy 3.10–3.11: 348 tests per interpreter and 100% statement and branch coverage.Prepared with OpenAI Codex assistance, including implementation, tests and independent review. Current and historical issues and pull requests, including the aware-datetime support in #54, were checked for duplicates.