2001-365.
* RFC 3339 Date and Time on the Internet: Timestamps specifies YYYY-MM-DD, i.e. a particular subset of the options allowed by ISO 8601.
* RFC 5322 Internet Message Format specifies day month year where day is one or two digits, month is a three letter month abbreviation, and year is four digits.

Difficulties

Many numerical forms can create confusion when used in international correspondence, particularly when abbreviating the year to its final two digits, with no context.

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