Daylight Savings JavaScript Test

daylightsavings.js

const stdTimezoneOffset = (date) => {
    const jan = new Date(date.getFullYear(), 0, 1);
    const jul = new Date(date.getFullYear(), 6, 1);
    return Math.max(jan.getTimezoneOffset(), jul.getTimezoneOffset());
};

const isDstObserved = (date) => date.getTimezoneOffset() < stdTimezoneOffset(date);

const offset = start.getTimezoneOffset();
const start = new Date(start.getTime() - (offset*60*1000));
console.log('isDstObserved(start)', isDstObserved(start));