Having trouble with the date range picker

I have tried without success to get this error resolved. However, after several hours of ‘fixing’ it. The error is relentless!

Any ideas why it keeps returning “Please enter a valid date.” The date is returned by the date range picker, i.e., date, date_start, date_end.

date is a type=“text”
date_start and date_end are type=“date”

As you can see it is these two that throws the error.

Please see the error shown in the image below.

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