How do I make timestamped photos admissible

Hey all,

So I am currently taking screenshots of something each day for family court. I am currently taking the screenshot on iPhone and uploading straight away to a google drive.

The screenshot shows the time and date on my phone.

How can I make it 100% bullet proof that the other side cannot say I adjusted the time and date.

Surely they must be a way that it is not conversional the screenshots are taken at a particular date and time.