Get Timezone with Intl : iOS, Android, Browser

Ionic Framework Ionic Angular
1

Using Ionic, is this the correct method to get the timezone for iOS, Android as well as the browser:

Intl.DateTimeFormat().resolvedOptions().timeZone

I am new to App development and I am not sure if the browser object Intl is available in Ionic when deployed as an App.

2

What I would use here is new Date().getTimezoneOffset().