Here is a little script that should convert the column to a JMP date time value
names default to here(1);
dt=current data table();
for each row(
:date = substr(:date, 1, length(:date)-length(word(-1,:date,"-"))-1);
);
dt:date << data type(numeric)<<modeling type(continuous);
dt:date << format("yyyy-mm-ddThh:mm:ss");
Just replace the values of :Date to whatever your column name is
Jim