How to ADJUST islamic calender in ipad/iphone

[iMore Question]

There is one day difference my iphone say it is the 1 st of shawal and actually it is the second

 

[Ledsteplin]

Disable the Calendar. Then add it back in Settings.

Launch the Settings app on your iPhone or iPad.
Tap on Mail, Contacts, Calendars.
Tap on Alternate Calendars under the Calendars section.
Tap on any one of the supported alternate calendars you'd like to use instead of the standard format.

Here's the guide:
http://m.imore.com/calendar-iphone-ipad

http://m.imore.com/how-enable-and-use-alternate-calendar-formats-iphone-and-ipad