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javascriptdatetimeinternationalization

Timezone offset by timezone name for a specific date in Javascript

How can I find timezone offset in hours or minutes using timezone name for a specific date.

Example use would be :

var offset = findOffset("America/New_York", new Date(2019,08,07))
// offset is -4

I am hoping to find a solution using native JS, but if it does not exist I am also ok with using some libraries.

Solution

  • So here is the answer I found

    const findTimeZoneOffset = (tz,date) => {
  let utcDate = new Date(date.toLocaleString('en-US', { timeZone: "UTC" }));
  let tzDate = new Date(date.toLocaleString('en-US', { timeZone: tz }));
  let diff = ( tzDate.getTime() - utcDate.getTime() ) / 1000 / 60 / 60;
  return diff;
};

    and as expected

    findTimeZoneOffset("America/New_York", new Date(2019,08,07))
// returns -4