Count down timer

Hi, i want decrement timer function. if i enter value in numerical feild and press the button after timer will start decrement count.if any solution is there?

https://docs.inductiveautomation.com/display/DOC80/Vision+-+Timer

abs(dateDiff(dateArithmetic({[.]time_PressButton}, {[.]setup_TimeAllotted}, “minutes”), now(), “minute”))

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