Julian Dates

These are dates sometimes used for best-by dates or for shorthand dates on food products and such

The way to recognize these is that they have five letters.

YYDDD

The first two letters are the YY and they are the last two of the date. The last three is literally which day it is. ex:

Date: 01-May-2012
Julian Date: 12122

importantly, This tool can only convert date values after Jan 1, 1970.