@sahar540 Based on this topics eventual conclusion…
The “reset” is referenced by the parameter t.hasStartTime()
And based on the example link in the Docs for the Time Input Widget…
It seems there are multiple parameters to send
Blynk.virtualWrite(V1, startAt, stopAt, tz, days);
I would recommend trying something like this (untested!! - you will have to fiddle around with the syntax to get it right, if possible)…
Blynk.virtualWrite(V10, 0, 0); // for "resetting" startAt & stopAt
PS, I merged your current topic back into your past topic about same issue.