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YY format
Two-digit-year format. This format uses only two digits to describe the calendar year and thus omits information about the specific century. For example, 98, 9/98 and 4/4/98 are all two-digit-year dates.
YYYY format
Four-digit-year format. This format uses four digits to describe the calendar year; and the century is not assumed or interpreted. For example, 1952, 2001 and 1837 are all four-digit year dates because the specific century is not ambiguous. | 
