convert mountain time to gmt in javascript

index.tsx
function convertMountainToGMT(date) {
  // Get the timezone offset for Mountain Time in minutes
  const mtOffset = -420;
  
  // Convert the date to UTC time by adding the timezone offset
  const utcTime = date.getTime() + (date.getTimezoneOffset() * 60000);
  
  // Convert the UTC time to GMT by subtracting the timezone offset for Mountain Time
  const gmtTime = new Date(utcTime - (mtOffset * 60000));
  
  return gmtTime;
}
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index.tsx
const mtDate = new Date('2021-07-15T12:00:00-06:00');
const gmtDate = convertMountainToGMT(mtDate);
console.log(gmtDate.toUTCString()); // Outputs: 'Thu, 15 Jul 2021 18:00:00 GMT'
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