DateAdd user inputs the date

[Charlie94]

DateAdd(DateInterval.Hour, -9, #_ _ :_ _ :_ _ #)

i want to use the DateAdd function but instead of adding to a specified time, i want the user to input a time(with a text box)

i am fairly new to this so the solution is probably obvious.

if you are curious im doing a time zone program(to work out the time in a different time zone)