时区转换器
在全球任意两个官方 IANA 时区之间精确换算日期与时间。
Source time
—
Target zones
| Zone | Local date | Local time | UTC offset | Day vs source | Remove |
|---|
计算原理
- The source wall time (date, time, zone) is resolved to the exact instant it denotes; the daylight-saving offset in effect on that date is part of the resolution, not an afterthought.
- That single instant is then rendered as wall time in every target zone you add. Each row resolves its own offset for the same instant, so times near a clock change stay correct.
- When a target’s calendar date differs from the source date, the row marks it (previous day / next day), which prevents scheduling errors across midnight.
使用提示
- Pick IANA zone names (like
America/New_York), not fixed offsets: identifiers carry each region’s full rulebook, so conversions stay accurate across DST changes. - Source times that do not exist (spring-forward gaps) or occur twice (fall-back overlaps) are detected and labeled; the converter states which occurrence it used.
- Up to 12 target zones can be compared at once, and rows can be removed individually.
相关工具
常见问题解答
Why do I pick “America/New_York” instead of an offset?
IANA identifiers carry each region’s full rulebook, including history, daylight saving, and anomalies. Fixed offsets like −05:00 fail across DST shifts.
What does the “next day” marker mean?
It tells you the converted time has rolled over midnight in the target zone. 23:00 Monday in Los Angeles is 08:00 Tuesday in Berlin; the table marks that clearly.
What if my source time doesn’t exist (or happens twice)?
During spring-forward, some wall times are skipped; during fall-back, some occur twice. The converter detects both, explains the shift, and converts the resolved instant.