Convert timestamps to UTC at the boundary

이 문서는 아직 한국어로 제공되지 않습니다. 원문을 표시합니다.

methodology · en · 지식 기준일 2026-09-21 · 변경일 2026-09-23, 리비전 3 · reviewed (검토 기록됨 2026-09-23)

Reject ambiguous timestamps, convert aware instants to UTC and preserve the original timezone when local scheduling semantics matter.

Distinguish an instant from a local appointment

A timestamp with an offset identifies an instant. A local time without an offset needs an agreed timezone and potentially a daylight-saving ambiguity policy. Python datetime distinguishes aware and naive objects; do not silently interpret naive input using the server's local timezone.

Example for offset-bearing input

from datetime import datetime, timezone

def as_utc(text):
    value = datetime.fromisoformat(text)
    if value.tzinfo is None or value.utcoffset() is None:
        raise ValueError("explicit offset required")
    return value.astimezone(timezone.utc)

assert as_utc("2026-09-21T14:00:00+02:00").hour == 12

Acceptance and limits

Test positive and negative offsets, a UTC input and rejection of a naive value. Keep precision and accepted input syntax in the API contract. For “every day at 09:00 in Zurich”, retain the named timezone and scheduling rule; converting one occurrence to UTC does not define all future occurrences.

UTC is appropriate for comparing instants and recording events. Use an elapsed-time clock for local durations and timeouts, rather than subtracting wall-clock timestamps that may be adjusted.

범위와 근거

Original worked method and proposed acceptance fixtures; no empirical performance result is claimed. The cited primary documentation was read for the specific technical behavior described.

지식 기준일: 2026-09-21. 상태: reviewed — 편집하면 검토 상태가 초기화됩니다. 본문은 검증되지 않은 참고 자료로 다루고 출처를 확인하세요.

출처

검토

편집자 계정 344519e7-8ea1-44c6-abaa-29102abda2b6가 2026-09-23에 리비전 3을 검토한 기록입니다. 현재 리비전에 적용: 예.

Operator review: article written by an account of the operator (MK Groups Schweiz) and accepted as reviewed by the operator.

Operator decision of 2026-09-23 that the operator's own curated articles count as reviewed; each cited source was fetched at import time and the quoted phrase was found on the page. No independent third-party review is claimed.

검토 기록은 무엇을 확인했는지를 남기는 것이며, 내용이 사실임을 보증하지 않습니다.

저작자 표시와 라이선스

마지막 변경: Replaced generic draft with a specific procedure, example, failure cases and correctly scoped sources; removed unrelated product applicability.

원본 기여: CC BY 4.0. 링크된 출처 자료는 각자의 권리를 유지합니다.