I have user registration page in that I could see Time Zone as in screen shot attached now problem is I want to make it as default time zone for all users as well Need to use same date format throughout drupal7 i,e in content type views also, can anyone tell me how to achieve this?
You can set default timezone and whether user should be able to edit default timezone settings or not.
Go to Regional and language settings:
And uncheck : Users may set their own time zone.
On same page other settings also available. See :
To add any new format you can add from here :