If pyDefaultTimeZone is empty ,Time zone need to take dynamically from user mobile device location for mobile app or browser time
for user operator id time zone is not mentioned because users will be from different location.
So,timezone for date time in entire application should be take from mobile device location.
Application is both mobile app and desktop version.
For mobile application,timezone should take location of mobile device.
For Desktop ,timezone should be browser timezone.
In section for date time control in presentation tab,Operator time zone radio button is selected
Date time format is coming in GMT by default taking Server timings.
Attached the screen shot.
Please post your responses