Install bower install moment-timezone --save # bower npm install moment-timezone --save # npm yarn add moment-timezone # Yarn Format Dates in Any Timezone var jun = moment("2014-06-01T12:00:00Z"); var dec = moment("2014-12-01T12:00:00Z"); jun.tz('America/Los_Angeles').format('ha z'); // 5am PDT dec.tz('America/Los_Angeles').format('ha z'); // 4am PST jun.tz('America/New_York').format('ha z'); // 8