A picture would make this easier but here goes...
Date code (year of manufacture) is the two capital letter code on the left side of the slide (immediately to the left of the ’antler’). Here is a link to reading the code: HK Date Codes ? sevengun. So, in the picture below, AG is the date code and that means it was manufactured in 2006.
As to the trigger, it’s either DA/SA or LEM/CDA. Here’s a link to HK USA’s site: https://hk-usa.com/hk-models/p2000-sk/. Tap the ‘READ MORE’ red bar and scroll down to find out about the different model offerings.
If this doesn’t answer your questions, ask again in this thread as you don’t have enough posts to PM me... or maybe just Google HK ‘LEM’ or ‘CDA’ trigger to read up on it.