YYDDD

AcronymDefinition
YYDDDYear, Julian Day (date format)
References in periodicals archive ?
Because computer processing cycles were so expensive, mainframe programmers of the 1970s and 1980s often converted the MMDDYY date into the shorter Julian format yyddd, which used the last two digits of the year and a number, between one and 365, indicating the number of days from January 1 to the date being represented (February 1, 1997, for example, translates as 97302).