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Year, month and day in fixed order, largest unit first.
Also known as: ISO date format, Extended date format
ISO 8601 writes a date as year, month and day in that order, each zero-padded. It exists because the day-month-year and month-day-year conventions are ambiguous for the first twelve days of every month, and it sorts correctly as plain text, which no other format does.
Writes a date as year, month and day in descending order of magnitude, each zero-padded to a fixed width.
Contexts: Technical drawing, Maps
Removes the ambiguity between the day-first and month-first conventions, which produce different dates for the first twelve days of any month.
Contexts: Technical drawing, Maps
Sorts correctly as ordinary text because the fields run from largest to smallest, which is why it is the format used in file names and logs.
Contexts: Technical drawing, Maps
Four numerals, a hyphen, two numerals, a hyphen and two numerals, written without spaces.