The 5 laws of API dates and times | API UX: "Law #1: Use ISO-8601 for your dates
There’s really no debate here. From the W3C to the IETF, and even XKCD, the Internet has come to operate on this standard. Don’t try to be smart and do it differently. ISO-8601 provides a host of varieties on how to display dates/times/timezones."
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