-- On license portal we see expire date for CAS:
On portal, date format is YYYY-MM-DD
On CAS UI , date format is MM/DD/YYYY and it would use time zone of box to show time relative.
On CAS CLI -- Running show license command would also show YYYY-MM-DD
Also on Management center format is YYYY-MM-DD .
In Utilities > system information , We have key named "expires" which would have value of expire date in epoch time. Example: 1875398400000.
Below screenshot show CAS web UI , Portal and converted epoch time. This CAS in UTC -7:00 timezone.
Its same date but in different date format.
License Portal , CLI and management centers - YYYY-MM-DD
CAS Web User interface : MM/DD/YYYY + timezone offsite.
To verify this, go to Utilities > system information fine key "expires" it would have value in epoch time.
Next use any Epoch time converter which also can offset using Time zone.