Get TimeZone abbreviation?

[paulspiteri]

Is there a way to get the abbreviation of the current timezone? And specifically, how to determine if in daylight saving? (e.g. EDT or EST)
thanks

[enchorb]

+1

[csandman]

This isn't the most elegant solution, but you can do it with the native .toLocaleString() function. You can't set up the arguments for it so that only the timezone name is returned, but you can extract it from the formatted string. Here's a TypeScript example:

export const getShortTimezoneName = (date: Date): string => {
  const timezoneDateStr = date.toLocaleString('en-US', {
    timeZoneName: 'short',
  });

  const timezoneName = timezoneDateStr.split(' ').pop();
  if (!timezoneName) {
    throw new Error('Could not parse timezone name');
  }

  return timezoneName;
};

This only works with TZDate (not TZDateMini) because it overrides the .toLocaleString function to add the specified timezone it's in as an argument: https://github.com/date-fns/tz/blob/main/src/date/index.js#L56-L61

Like I said, it's not the most elegant, but I've used it for a while with good success. Plus it will be timezone aware for EDT vs EST and PDT vs PST.

[cbejensen]

With native JS:

new Intl.DateTimeFormat("en-US", {
  timeZone: 'America/New_York',
  timeZoneName: "short",
})
  .formatToParts(new Date())
  .find((part) => part.type === "timeZoneName").value;

Note that you will see different results with different locales (e.g. en-US vs en-GB)