Change the price of the product in a payment field based on the value of a date field

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Sorry, somehow submitted this before inputting any information. Curious if there is a way to put in conditions based on date.  We are setting up registration and have an early bird, regular and late registration cost.  Is there a way to have it automatically change the registration price based on the the date they register?  Here is the form: https://www.jotform.com/nationalofficeusapl/san-diego-2017

Thank you so much for clarifying your concern, we appreciate it.

With regards to what you are asking, if you have the product(s) listed in a payment field, then it is not possible to change the value of the product(s) base on the date field's value.

However, if you constructed the computation of the total amount outside the payment field and just pass the total amount to the payment field following the instructions in this guide, How-to-Pass-a-Calculation-to-a-Payment-Field, then it is possible.

I, however, see that you already have existing submissions on your form. Changing the payment type should not affect the existing submission data of the payment field as long as it is the same payment field.

I hope this helps. If you have any further questions, please feel free to contact us again anytime. Thank you.