How to get calender date from a date field in Java in a particular time zone?

I have a date stored in a date variable(java.util.Date), (say 2015-4-4 15:30:26-0700) in yyyy-mm-dd hh:mm:ss timezone format.

No, you have a Date variable. That doesn't have any particular format. Ignore what toString() tells you - that's just formatting it in your local time zone, in a default format. That doesn't mean the format or time zone is part of the state of the Date object - that just represents a point in time.

It sounds like you want:

// Whatever pattern you want - ideally, specify the locale too
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// Whatever time zone you want
format.setTimeZone(...);
String text = format.format(date);

Alternatively, if you just want a Calendar value:

TimeZone zone = ...; // Whatever time zone you want
Calendar calendar = Calendar.getInstance(zone);
calendar.setTime(date);
// Now use calendar.get(Calendar.YEAR) etc