Calendar Converter

I found this an interesting read, and one of the most clear and concise treatments of the subject of calendars:


The International Standards Organisation (ISO) issued Standard ISO 8601, “Representation of Dates” in 1988, superseding the earlier ISO 2015. The bulk of the standard consists of standards for representing dates in the Gregorian calendar including the highly recommended “YYYY-MM-DD” form which is unambiguous, free of cultural bias, can be sorted into order without rearrangement, and is Y9K compliant.

— I like the Y9K compliance