Panasonic electrolytic capacator date code?

I am not able to find explanations of Panasonic's date codes for their electrolytic capacitors that match what I am seeing on a recent batch of various caps.

It is not a simple YYWW like Nichicon uses. Have searched here and AudioKarma, and googled....

Does anybody know how to read their date code?
 
In my recent batch of Panasonic FC, FM, and FR caps I am seeing two types of codes:

The first code type is four numeric digits + two alphabetic characters. Like these:
1509UL
1627EK
1504DL


And the other code type is two numeric digits + one or two Roman numerals + two alphabetic characters. As below:
17IIGN
93IVDB
16VGN