From the screenshot you are displaying, it appears that whatever methodology you are using to generate the TS_UTC column, that it is being generated as a character column. The following JSL will convert from your character column to a numeric, continuous column, with your desired display format.
names default to here(1);
dt=current data table();
dt:TS_UTC<<data type(numeric)<<modeling type(continuous)<<format("yyyy-mm-ddThh:mm:ss");
Jim