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johnloy/isDstObserved.js

Created May 3, 2021 21:01
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isDstObserved.js
function isDstObserved(date = new Date()) {
var jan = new Date(0, 1);
var jul = new Date(6, 1);
const stdTimezoneOffset = Math.max(
jan.getTimezoneOffset(),
jul.getTimezoneOffset()
);
return date.getTimezoneOffset() < stdTimezoneOffset;
}
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