The easiest way to do this is with a new column with a formula.
The Informat() function will convert everything before the "T" and the Word() function makes it easy to extract just that portion.

More about dates and the Word() function:
Using dates, times, datetimes and durations in JMP
If you learn only one Formula Editor function, Word() is the one
How to convert these kind of timestamp 2019-06-10T20:51:46+0000 into ''yyyy-mm-dd''.
I have tried many of format patterns but its not working.
Currently the data type of timestamp column is Character and modelling type is Nominal