Custom Registration Form no longer sending right data to hidden fields in the form

I have a form that allows users to pick a date to schedule a call. The dates are filled from a google sheet. It has several hidden fields that are auto-filling based on the date that the user picks. However, we are seeing some discrepancies this year, such as the time in the hidden field being am instead of the pm time they chose. Here is a video overview:

I am wondering if someone might be able to help me - am I on the right track? Is there something I need to change? Am I on the right track that it might be the javascript code?

Thanks in advance!

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