Date and time format - ISO 8601

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The of the representation thus corresponds to chronological order, except for date representations involving negative years. Better use directly UTC as your only time zone where this is possible and then you do not have to worry about time zones and daylight saving time changes at all. Parsing is case insensitive.

For printing, this outputs the rightmost two digits. Values are not validated, thus parsing a date string of '2012-00-65' would result in a temporal with three fields - year of '2012', month of '0' and day-of-month of '65'.

A summary of the international standard date and time notation

This content is no longer maintained. Academic Computing and Communications Center ISO 8601 Dates: What They Are and How to Use Them 1. When you see a written date, is it clear what date that really is? In Europe, it's 23. But humans in the US might not recognize 23. Or is that February 1, 1001? We're good for the which one is the year question in the year 2000, because 00 has to be a year. Writing a four-digit year will at least tell you which one is the year. ISO Standard 8601 for Dates and Times All the way back in 1988, the International Standards Organization ISO decided, for obvious reasons, that these country-specific all-numeric date formats had to go. The ISO standard date format is defined in the ISO 8601: yyyy-mm-dd ISO 8601 defines acceptable formats for times as well; it's available in PDF form at: For additional links, see J R Stockton's page's ISO standard 8601 section, This ISO 8601 format for dates has a number of good features. Written Dates: Unambiguous But Not Useful for Data In written text, the traditional written forms of a date are also unambiguous, because a four-digit year is used and the month name is written as a word rather then a number. In English, we have the American form, June 23, 1998, and the British form, 23 June 1998. Regardless of the order, you can tell that the four-digit item is the year, the word is the month, and the two-digit item is the day. However, these literate forms should be avoided in any data processing use, because data is generally language-free and because dates in these formats cannot be sorted without conversion. Unambiguous Around the World Being unambiguous around the world remains the absolute requirement. In the financial world, for instance, an ambiguous date on a transaction could mean a difference of a significant amount of money, if interest calculations are involved. After you read the links below, you will understand why there can be no other date formats tolerated in this day of global communication. And, for other than literary purposes, such as for finance or data processing, the all-numeric ISO form should be the only form used. You might want to let them know. Please send comments and reports of broken links to the author: Using ISO 8601 Dates Previous: Next: 2001-12-21.

Number: If the count of letters is one, then the value is output using the minimum number of digits and without padding. The resolver style is used to control how phase 2, resolving, happens. Similarly, the old German time notations hh. Scope provides normative subject matter and the particulars. I am saying that 2. Otherwise use the Number rules above. Year: The count of letters determines the minimum field width below which padding is used. Next, copy the ISO 8601 columns onto the originals paste special: paste values only. Any time or zone will be retained unaltered unless overridden. Parsing iso 8601 format case sensitive.