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

I haven't tried the Joda library. This code should work.

public boolean checkUserTimeZoneOverLaps(TimeZone companyTimeZone,
        TimeZone userTimeZone, Date companyWorkStartHour,
        Date companyWorkEndHour, Date userCurrentDate) {

    Calendar userCurrentTime = Calendar.getInstance(userTimeZone);
    userCurrentTime.setTime(userCurrentDate);
    int year = userCurrentTime.get(Calendar.YEAR);
    int month = userCurrentTime.get(Calendar.MONTH);
    int day = userCurrentTime.get(Calendar.DAY_OF_MONTH);

    Calendar startTime = Calendar.getInstance(companyTimeZone);
    startTime.setTime(companyWorkStartHour);
    startTime.set(Calendar.YEAR, year);
    startTime.set(Calendar.MONTH, month);
    startTime.set(Calendar.DAY_OF_MONTH, day);

    Calendar endTime = Calendar.getInstance(companyTimeZone);
    endTime.setTime(companyWorkEndHour);
    endTime.set(Calendar.YEAR, year);
    endTime.set(Calendar.MONTH, month);
    endTime.set(Calendar.DAY_OF_MONTH, day);

    if (userCurrentTime.after(startTime) && userCurrentTime.before(endTime)) {
        return true;
    }
    return false;
}

EDIT Updated the code to reflect Bruno's comments. Shouldn't be taking the dates of the company work timings.