Unable to change the year and day format in OWL Hijri Calendar 

I want to use the Hijri date time picker. According to your documentation by using setLocale('ar-SA') it will change the picker format in Hijri format but datetime picker cannot show Hijri year and day it shows year and day in English format.
I am unable to change the year and day format in the Hijri format. Please guide me related to this issue