LOOK SUBSCHEMA shows a compile date of 2012. Displaying the subschema in the subschema compiler, it has a LAST UPDATE of Jan 16, 2018 which is when it was last generated.
Why are these dates different?
Release: All supported releases.
The LOOK indicates the load module date. So, when that subschema load module was generated, the date was 2012.
When it's displayed in the dictionary, the date the source was last updated was 01/16/18.
If the subschema is generated, then run the LOOK, the date should be updated.