Really short 'didn't know you could do that' moment.
Playing around with createTimeSpan() today in a little test bed, and gave this a try and it worked –
now = now();
dts = createTimeSpan(0,2,0,0);
then = now + dts;
#TimeFormat(Now(), "HH:mm:ss")# : #TimeFormat(then, "HH:mm:ss")#
And look at that, that just added 2 hours to the time.
Normally I would have done that with a dateAdd(), but this actually quite quick.