juldate

Julian-format date: yy.ddd or yyyy.ddd. The number of digits assigned to the year is the same as specified in the Gregorian format, either two or four. The day of the year is left-padded with zeros to three characters.

gregdate

Gregorian-format date: mm/dd/yy or mm/dd/yyyy. The number of digits assigned to the year will be carried over to the result and must be either two or four. The length of the month and day fields is unimportant, except that the date must be valid.