Facing issue with Schedule and TimeZone

[gana2]

Hello Everyone, I'm facing an issue with the Schedule and Timezone.

Requirement - Need to send additional Approval if the change window is in Working Hours.

Note - The instance and the user who is creating the change are in Australia/Melbourne Timezone.

Schedule(cmn_schedule) also in Australia/Melbourne.

1. I have created an Australia/Melbourne schedule and schedule entry for Monday to Friday 6:00:00 to 22:00:00 

2. Then Created a change request which change the planned start date is on Monday (2024-01-08 16:11:40).

3. Now from the BG Script I'm checking planned start date is on schedule or not but it is showing it is not on schedule.

below is the script 

-------------------------------------------------------- Script -------------------------------------------------------------------------

var gr = new GlideRecord('change_request');

gr.query('sys_id', 'c83c5e5347c12200e0ef563dbb9a7190');

gr.query();

if (gr.next()) {

var startDateTime = new GlideDateTime(gr.start_date);

gs.print('GMT Start time -'+startDateTime);

var tz = Packages.java.util.TimeZone.getTimeZone('Australia/Melbourne');

startDateTime.setTZ(tz);

var timeZoneOffSet = startDateTime.getTZOffset();

startDateTime.setNumericValue(startDateTime.getNumericValue() + timeZoneOffSet);

gs.print('Australia/Melbourne Start time - '+startDateTime);

    var g = new GlideRecord('cmn_schedule');

    g.addQuery('name', '8-5 weekdays');

    g.query();

    if (g.next()) {

        var sched = new GlideSchedule(g.sys_id);

        // Check if either start or end date is in the schedule

        if (sched.isInSchedule(startDateTime)) {

            gs.print("In Schedule Need Approval");

        } else {

             gs.print("Not In Schedule No Need Approval");

        }

    }

}

-------------------------------------------------------- Script -------------------------------------------------------------------------

out put 

*** Script: GMT Start time -2024-01-08 05:11:40
*** Script: Australia/Melbourne Start time - 2024-01-08 16:11:40
*** Script: Not In Schedule No Need Approval

And also if I'm trying to print getDayofWeek if date is on Sunday it's giving 1 some times and 7 some times 

Could you please someone help how to get this requirement 

Thanks in advance 

Ganasekhar