Dates and times
Dates are expressed as year, month, day and are separated by a hyphen. Times are expressed on a 24-hour clock.
International authority: International Organization for Standardization (ISO), https://www.iso.org
Standard: ISO 8601
Rationale: Date and time formats are represented with the largest units given first. From left to right the ranking is year, month, week, day, hour, minute, second. This standard, in addition to being used in many Asian languages, solves ambiguities in the date notations used in Canada, the United States, and the United Kingdom.
Usage: Dates are expressed numerically as year, month, day and are separated by a hyphen. Times are expressed on a 24-hour clock. A colon separates hours, minutes, and seconds. Coordinated Universal Time (UTC) times are expressed as “Z.” Local time zones are expressed as the number of hours from UTC.
Apple Watch Series 9 was introduced on 2023-09-12.
The file will be posted at 18:00Z.
The file will be posted at 18:00 PST (UTC–8).