Help using the clock tool

[mahmowd]

please help
I want after the user enters the date and presses button 1 is done
Add 40 weeks from the date added and it appears in the label how do I do it

[dora_paz (Dora)]

Like this

[Ded_Sec_00 (David)]

Use in DatePicker the Instant Block and add it like you have in your Screenshot.