Revenue.io's Calendar Booking product sets your Time Zone based on the Time Zone value saved in your Salesforce user account.
To confirm what your current Time Zone is in the Revenue Admin Console, navigate to your user settings page and view the "Time Zone" data point here:
Updating your Time Zone
If you want to update this Time Zone value, follow the below steps:
1.) From the Salesforce home page, click the user icon on the top-right
2.) Click on Settings:
3.) In the left hand navigation, click to expand the My Personal Information grouping. Then click on the Language & Timezone nested nav option:
4.) On the Language & Timezone page, click the Time Zone field dropdown and select the desired new Time Zone. Then click Save.
5.) To see this change in the Revenue.io Admin Console, you'll need to log out and log back in.