Chances are less...Also, In the above code also.. add var before every variable to keep it safe and local .

ok, Thank you :)

this does not work on firefox

Hy Peter,

I tried your approach, but one issue is, I have 'timezone', in UTC offset values, but the toLocaleTimeString(locale, options) accepts the timeZone option in "Area/Location" format, I need an option to accept timeZone offset.

I'm still pretty new so, this may sound stupid but....

I was thinking you set a middle point in GMT as a var inside a function. GMT would be the time at GMT +0 and do a Switch statement. (Not using actual formatting or punctuation) Case time zone a; Answer = GMT -1 ; Break; Case time zone b; Answer = GMT +1; Break

ajay ramgounda You could use a map to replace the GMT Offset with a zone, but zones respect summer time and GMT Offsets not. So it is a bad solution:

const date = new Date()

const map = new Map([
  [-11, 'Pacific/Niue'],
  [-10, 'Pacific/Tahiti'],
  [-9, 'Pacific/Gambier'],
  [-8, 'Pacific/Pitcairn'],
  [-7, 'America/Vancouver'],
  [-6, 'America/Denver'],
  [-5, 'America/Rio_Branco'],
  [-4, 'America/Manaus'],
  [-3, 'America/Cayenne'],
  [-2, 'Atlantic/South_Georgia'],
  [-1, 'Atlantic/Azores'],
  [0, 'GMT'],
  [1, 'Europe/Brussels'],
  [2, 'Europe/Helsinki'],
  [3, 'Asia/Riyadh'],
  [4, 'Asia/Dubai'],
  [5, 'Asia/Tashkent'],
  [6, 'Asia/Urumqi'],
  [7, 'Asia/Bangkok'],
  [8, 'Asia/Singapore'],
  [9, 'Asia/Chita'],
  [10, 'Pacific/Chuuk'],
  [11, 'Pacific/Pohnpei'],
  [12, 'Pacific/Wake'],
])

date.toLocaleTimeString('en-US', {timeZone: map.get(-6)})

A better solution is a self made converter:

function dateToGMT(date = new Date(), offset = 0) {
 let hours = date.getUTCHours() + offset
 if (hours > 23) hours = 24 - hours
 if (hours < 0) hours = 24 + hours
 return `${hours}:${date.getUTCMinutes()}:${date.getUTCSeconds()}`
}

Or you use something like moment.