Many times I can't tell the difference between a date and a number in that range. I can check the format of a column, but if I'm just holding a date value it can be a problem.
## Possible Solution
As date() says that it marks a date time value internally for output purposes. I'm wondering if it would be possible to just have all date time formats use this value. Plus it would have the benefit of having dt:datetime return a human readable output. If all date time jmp values used this internal value, IsDate() could just check that value.
I obviously could be way oversimplifying it in my brain.