Using End of the Trial field for Stripe subscription

I am just started to use Stripe subscriptions within my Test app and am able to subscribe users to a plan configured within Stripe that has a 7 day free trial period.

However, I would like to offer users the option to finish their trial early and thus get access to further options within my app which are not available to them during the free trail period.

To end the trial now I have used a ‘Subscribe the user to …’ action again but this time set the ‘End of the Trial’ field to ‘Current date/time’. Unfortunately Stripe does not appear to be using this field and the users Trailing period continues as before in Stripe.

Can you advise if I need to change the format of the ‘Current date/time’ argument from the default to work with Stripe?

Any help would be much appreciated.