On my Samsung Galaxy S6 Edge: On lock screen

[Android Central Question]

my calendar says today's date: Mon, November 13 (Aban22). How do I delete Aban 22. What is that??

 

[belodion]

At a guess, I’d say it was the date as expressed by a calendar other than the Gregorian. For what region is the phone? Find that in Settings, About Phone.

 

[A Bochur]

it's apparently the Persian calendar. to disable it, go into the calendar settings>>general and disable Persian.
(this is assuming you are using Google calendar. it might be different in other ones)