![]() ![]() This format has advantages such as being largely unambiguous, easy to parse by machine, easy to read by humans across cultures. The T separates the date portion from the time-of-day portion. For a date-time the format YYYY-MM-DDTHH:MM:SS±HH:MM:SS is used. ISO 8601įurthermore, best practice in formatting date-time textually for computing is to us the ISO 8601 standard formats. ZuluĪs a shortcut for an offset of zero, the letter Z is commonly used to mean UTC itself. The leading zero and the colon are both optional but I have seen libraries break when encountering a value such as -0800 or -8. The best in practice is with both hours and minutes along with a colon, such as +00:00, +05:30, or -08:00. To write that string with an offset, various conventions may be applied. If the string is meant to represent a moment at UTC itself, that means an offset-from-UTC of zero. If a string indicates a specific moment, it must indicate either a time zone ( Continent/Region formatted name) and/or an offset-from-UTC as a number of hours-minutes-seconds. That first part is a bad example, with the date-time string lacking an indicator of its offset or zone. Here is some more practical advice, with code examples. So for all practical purposes in most apps, no difference at all. You can use the terms interchangeably, with the difference being literally less than a second. correctly summarizes the technical differences - for details follow the links to detailed pages in Wikipedia.įor programmers building business-oriented apps, the upshot is that UTC is the new GMT. ❌ The accepted Answer is neither correct nor useful.
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