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Possible to set new user’s site time zone at user creation using Gravity Forms?

Let’s say I have a multisite network running with Buddypress and has Gravity Forms installed with the GF User Registration addon. During new user/site registration, is there ANY way I can have the user set their time zone by selecting from a Gravity Form drop down menu the timezone they want?

Basically, I don’t want the user to have to login to WP and then go to General settings to change their time zones. Is there any way of achieving this without having to edit any core WP code?