date.toLocaleTimeString

dateObj.toLocaleTimeString([locales[, options]])

var date = new Date(Date.UTC(2012, 11, 12, 3, 0, 0)

// toLocaleTimeString() without arguments depends on the implementation,
// the default locale, and the default time zone
console.log(date.toLocaleTimeString()
// → "7:00:00 PM" if run in en-US locale with time zone America/Los_Angeles

function toLocaleTimeStringSupportsLocales() {
  try {
    new Date().toLocaleTimeString('i'
  } catch (e) {
    return e​.name === 'RangeError';
  }
  return false;
}

var date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0)

// formats below assume the local time zone of the locale;
// America/Los_Angeles for the US

// US English uses 12-hour time with AM/PM
console.log(date.toLocaleTimeString('en-US')
// → "7:00:00 PM"

// British English uses 24-hour time without AM/PM
console.log(date.toLocaleTimeString('en-GB')
// → "03:00:00"

// Korean uses 12-hour time with AM/PM
console.log(date.toLocaleTimeString('ko-KR')
// → "오후 12:00:00"

// Arabic in most Arabic speaking countries uses real Arabic digits
console.log(date.toLocaleTimeString('ar-EG')
// → "٧:٠٠:٠٠ م"

// when requesting a language that may not be supported, such as
// Balinese, include a fallback language, in this case Indonesian
console.log(date.toLocaleTimeString(['ban', 'id'])
// → "11.00.00"

var date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0)

// an application may want to use UTC and make that visible
var options = { timeZone: 'UTC', timeZoneName: 'short' };
console.log(date.toLocaleTimeString('en-US', options)
// → "3:00:00 AM GMT"

// sometimes even the US needs 24-hour time
console.log(date.toLocaleTimeString('en-US', { hour12: false })
// → "19:00:00"