Calculate with collection field TIME and timepicker

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4

Maybe something like this (I didn’t test it):

let timeSplitter = $w("#timePicker1").value.split(":");
let hour = Number(timeSplitter[0]) ;
let sumMinutes = Number(timeSplitter[1]) + 15;
let additionaHours = Math.floor(sumMinutes/60);
let newHour = ((additionaHours  + hour) % 24).toString();
let newMinutes = (sumMinutes % 60).toString();
$w("#timePicker2").value = newHour.padStart(2,'0')+ ":"  + newMinutes.padStart(2,'0');

(UPDATED (forgot Math.floor())