title: How to get Australia/Sydney timezone offset in javascript/nodejs?
body: <p>Based on the daylight time, Austalia/Sydney timezone offset (UTC to AEST difference) is +10:00 (from April first Sunday) and +11:00 (from October first Sunday).</p>
  <p>The difference is 600 minutes or 660 minutes.</p>
  <p>How to get the time difference in javascript/nodejs/momentjs ? Irrespective of server time?</p>