I guess you don't want to invoice the customer before the trial period has passed. What you could to is to create a termed subscription with the intial term equaling the trial period and add a discount of 100% for that period and set renew to evergreen (or to a specific term). Once the initial term has passed you either manually have to renew the subscription or if auto renew is set to true the subscription will be renewed to evergreen and and invoice is created with the amount specified for the normal price.
This is the only way I can see that you can do this without using more dates.
If you find my suggestion as the solution, please mark it.
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