var innerDate = document.getElementById('datetimepicker3').value;
The format I get from this line is: innerDate: "2021/07/07 14:00"
But I need to parse the date and time information here. How can I convert Start Date and Start Time into two separate variables?
Try this:
var innerDate = new Date(document.getElementById('datetimepicker3').value)
Or you can attach an event handler to get the date whenever it changes
<script type="text/javascript">
$("#datetimepicker3").on("dp.change", function (e) {
let date = e.date;
console.log(date);
// no need to convert to a date
});
</script>