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出典:Wikipedia
出典:『Wikipedia』 (2011/06/04 00:05 UTC 版)
An ordinal date is a calendar date typically consisting of a year and a day of year ranging between 1 and 366 (starting on January 1), though year may sometimes be omitted. The two numbers can be formatted as YYYY-DDD to comply with the ISO 8601 ordinal date format.
ordinal date