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On Wikipedia time zone offsets are explained as the difference in hours and minutes from standard UTC time. However, DateTimeFormatter supports zone-offset pattern XXXXX, which "outputs the hour and minute and optional second, with a colon, such as '+01:30:15'."
Are offsets like +01:30:15 ISO valid? If not, based on which standard does Java define such offsets?
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The OffsetTime class, in effect, combines the LocalTime class with the ZoneOffset class. It is used to represent time (hour, minute, second, nanosecond) with an offset from Greenwich/UTC time (+/-hours:minutes, such as +06:00 or -08:00).
What is a "zone offset"? A zone offset is the difference in hours and minutes between a particular time zone and UTC. In ISO 8601, the particular zone offset can be indicated in a date or time value. The zone offset can be Z for UTC or it can be a value "+" or "-" from UTC.
Be aware that java. util. Date objects do not contain any timezone information by themselves - you cannot set the timezone on a Date object. The only thing that a Date object contains is a number of milliseconds since the "epoch" - 1 January 1970, 00:00:00 UTC.
Breaking Down the Difference An offset is the number of hours or minutes a certain time zone is ahead of or behind GMT**. A time zone's offset can change throughout the year because of Daylight Saving Time. Sometimes laws change a time zone's offset or daylight savings pattern.
It's not supported by ISO-8601, but it is a valid offset as recorded in the IANA time zone database.
Sub-minute offsets are common in the data for the late 19th and early 20th century, before time zones were properly standardized. For example, Europe/Paris had an offset of +00:09:21 until 1911 (according to the IANA database).
The latest occurrence I can find for this is Africa/Monrovia which had a sub-minute offset until 1972!
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