Yes, if you sign into your account, you can schedule the start date for your plan. When scheduling a new plan, you can choose the start date and time that you begin your travels in the U.S.
For instance, you can choose the date that you begin your travels in the US, or if you need to top up an existing plan, you can choose a date that coincides with the last day of that plan.
You can also choose the time zone you’d like your plan to activate in, so make sure you choose the appropriate time zone for your destination.