js-step_setdatepicker.js

// randomize Date, and then add second Date which is 6 hours and 30 minutes later
var date = new Date();
var days_in_future = 50;
var add_minutes = 30;
var add_hours = 6;

date.setDate(date.getDate() + parseInt(Math.random() * days_in_future));
date.setHours(parseInt(Math.random() * 24));
date.setMinutes(parseInt(Math.random() * 60));

function td(number) { return (number < 10 ? '0' : '') + number;}
function frmt_day(date) { return date.getDate() + '.' + (date.getMonth() + 1) + '.' + date.getFullYear()); }
function frmt_hour(date) { return td(date.getHours()) + ':' + td(date.getMinutes())); }

var second_date = new Date(date.getTime() + 1000 * 60 * (add_minutes + add_hours * 60));
var hourInputs = document.querySelectorAll(".ui-timepicker-container > input");
var dayInput = document.querySelector("input.hasDatepicker");
dayInput.value = frmt_day(date);
hourInputs[0].value = frmt_hour(date);
hourInputs[1].value = frmt_hour(second_date);
callback(true);