under system properties , we didn't mentioned any timeZone.

my profile TimeZone is  "IST " -india

i just confused here, which timezone it is considering here.

My requirement is : as per PST 7AM need to trigger one condition , 18PM need to trigger another if-condition as per PST only

if (gdt.getDayOfWeekLocalTime() == 2) //Tuesday 2 7AM PST , 18 PM PST
{

if (gdtH.getHourOfDayLocalTime() == 7) {
email.setSubject("Gentle Reminder for TimeCard Approval of the week starts on " + par1.lastWeek);
email.addAddress("cc", par1.manager_email, par1.manager_name);
template.print('Hi ' + par1.user + ',</br></br>This is a gentle reminder, that the Timecards in Submitted State are overdue, for the week starts on, "' + par1.lastWeek + '" in the system. Kindly Approve or Reject the timecards last by 3PM PST. </br></br>');
template.print('<br/>');
}

if (gdtH.getHourOfDayLocalTime() == 18) {
email.setSubject("Final Reminder for TimeCard Approval of the week starts on " + par1.lastWeek);
email.addAddress("cc", par1.manager_email, par1.manager_name);
template.print('Hi ' + par1.user + ',</br></br>This is a final reminder, that timecard approval for the below Employees are overdue for the week starts on, "' + par1.lastWeek + '" in the system and needs immediate approval. </br></br>');
template.print('<br/>');
}

}