Where is the casting date on a Mopar Performance Crate 360?

"Julian date" is one that I'm not familiar with. I've only heard the term in passing but never asked nor was told what it is exactly.*
This engine did have a series of numbers and letters under the LH head, they were in a place that seems stupid when compared to the traditional methods where anyone that went to grade school could interpret it.
This number didn't have a T for "truck" but one character was a "1" though I don't know if that was a 1991 or 2001. Did they make the 5.9 engine in 1991?