Struggling with how to compare hours with different time zones in Java?

Question

I have 2 date object in the database that represent the company\'s working hours.

I only need the hours but since I have to save date. it appears like this:

Answer 1

Try something like this:

Calendar companyWorkStart = new GregorianCalendar(companyTimeZone);
companyWorkStart.setTime(companyWorkStartHour);

Calendar companyWorkEnd = new GregorianCalendar(companyTimeZone);
companyWorkEnd.setTime(companyWorkEndHour);

Calendar user = new GregorianCalendar(userTimeZone);
user.setTime(userTime);

if(user.compareTo(companyWorkStart)>=0 && user.compareTo(companyWorkEnd)<=0) {
  ...
}