以下のガイドはまだ日本語に翻訳されていないため、英語で表示しています。計算機自体はすべて日本語に対応しています。
この計算機の使い方
- Enter the date and time as it reads on the clock in the original location.
- Choose the original time zone and the time zone to convert to.
- See the converted time, both UTC offsets and the time difference.
計算式
The wall-clock time is first converted to Coordinated Universal Time (UTC) using the source zone's offset on that date, then to the target zone's local time. Offsets change during daylight saving time, so the date matters.
UTC = local time − offset(source)
Target time = UTC + offset(target)
Example
- 9:00 in New York on 8 November (EST, UTC−05:00) = 14:00 UTC.
- London is on GMT (UTC+00:00) in November, so it's 14:00 in London: a 5-hour difference.
- In July both observe summer time and the difference is still 5 hours, but for a few weeks in March and late October/November it is 4.
よくある質問
Why does the difference change during the year?
Regions start and end daylight saving time on different dates (the US in March and November, Europe in late March and late October), and many places don't use it at all.
What is UTC?
Coordinated Universal Time, the global time standard. Time zones are defined by their offset from UTC, such as UTC+09:00 for Tokyo.
Are half-hour time zones supported?
Yes. India (UTC+05:30), Nepal (UTC+05:45) and Newfoundland (UTC−03:30) are included.