Hi Amon,
I found a simpler way to do it,
1. Without converting the decimal to string in the first step.
2. Create just one calculated column with the formula
longdate("TST_TO")
Make sure that the datatype of this column is TIMESTAMP
I have checked this
Can you try this one? Its a lot simpler
I am sorry I couldn't come up with this one earlier and wasting your time.
But the error that you're getting, about numeric overflow, could actually point to some other error in the calculation view. Please check if you have some other Measure where the datatype cannot handle the result.
--Shreepad