Timezone Conversion

// Method 1: Get timezone offset
function getTimezoneOffset() {
    const offset = new Date().getTimezoneOffset();
    const hours = Math.floor(Math.abs(offset) / 60);
    const minutes = Math.abs(offset) % 60;
    const sign = offset > 0 ? '-' : '+';
    return `${sign}${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}`;
}

console.log('Timezone offset:', getTimezoneOffset());

// Method 2: Convert to UTC
function toUTC(date) {
    return new Date(date.toUTCString());
}

const localDate = new Date();
console.log('Local:', localDate);
console.log('UTC:', toUTC(localDate));

// Method 3: Convert to specific timezone (using Intl)
function toTimezone(date, timezone) {
    return new Date(date.toLocaleString('en-US', { timeZone: timezone }));
}

const date = new Date();
console.log('New York:', toTimezone(date, 'America/New_York'));
console.log('Tokyo:', toTimezone(date, 'Asia/Tokyo'));
console.log('London:', toTimezone(date, 'Europe/London'));

// Method 4: Format with timezone
function formatWithTimezone(date, timezone) {
    return new Intl.DateTimeFormat('en-US', {
        timeZone: timezone,
        year: 'numeric',
        month: '2-digit',
        day: '2-digit',
        hour: '2-digit',
        minute: '2-digit',
        second: '2-digit',
        hour12: false
    }).format(date);
}

console.log('NY formatted:', formatWithTimezone(date, 'America/New_York'));

// Method 5: List available timezones
function getTimezones() {
    return Intl.supportedValuesOf('timeZone');
}

console.log('Available timezones:', getTimezones().slice(0, 5));

// Method 6: Convert between timezones
function convertTimezone(date, fromTZ, toTZ) {
    const fromDate = new Date(date.toLocaleString('en-US', { timeZone: fromTZ }));
    const toDate = new Date(date.toLocaleString('en-US', { timeZone: toTZ }));
    return toDate;
}

const nyDate = new Date('2024-01-15T12:00:00');
const tokyoDate = convertTimezone(nyDate, 'America/New_York', 'Asia/Tokyo');
console.log('NY to Tokyo:', tokyoDate);