Yes, date functions would be the way to go. Since you're doing this multiple times, you may also want to use a custom function.
function GMTtoCST(d){
return DateAdd(d, -6, 'hours')
}
var d1 = Now()
var d2 = Date('2022', '5', '27', '15')
var d3 = Date('2017', '8', '11', '8')
Console(d1, GMTtoCST(d1))
Console(d2, GMTtoCST(d2))
Console(d3, GMTtoCST(d3))
- Josh Carlson
Kendall County GIS