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If a time zone designator is required, it follows the combined date and time. For example, "2007-04-05T14:30Z" or "2007-04-05T12:30−02:00". Either basic or extended formats may be used, but both date and time must use the same format. The date expression may be calendar, week, or ordinal, and must use a complete representation.
National standard format is yyyy-mm-dd. [161] dd.mm.yyyy format is used in some places where it is required by EU regulations, for example for best-before dates on food [162] and on driver's licenses. d/m format is used casually, when the year is obvious from the context, and for date ranges, e.g. 28-31/8 for 28–31 August.
Irish Summer Time: {{subst:Time zone|IST EU}} gives IST Indian Standard Time: {{subst:Time zone|IST}} gives IST ( UTC+05:30 ) Ireland being less inhabited than India, Indian Standard Time will be used more often than Irish Summer Time, and is therefore the default if no continent is specified.
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
Each zone line for a zone specifies, for a range of date and time, the offset to UTC for standard time, the name of the set of rules that govern daylight saving time (or a hyphen if standard time always applies), the format for time zone abbreviations, and, for all but the last zone line, the date and time at which the range of date and time ...
Irish Summer Time : {{subst:Time zone|IST EU}} gives IST Indian Standard Time : {{subst:Time zone|IST}} gives IST ( UTC+05:30 ) Ireland being less inhabited than India, Indian Standard Time will be used more often than Irish Summer Time, and is therefore the default if no continent is specified.
The Government of Canada recommends that all-numeric dates in both English and French use the YYYY-MM-DD format codified in ISO 8601. [11] The Standards Council of Canada also specifies this as the country's date format. [12] [13] The YYYY-MM-DD format is the only officially recommended method of writing a numeric date in Canada. [2]