jtc-utils/mjs/util/getTimeZoneOffset.js

Utilities for Japanese Traditional Companies

import { getTimeZone } from "./getTimeZone.js";
export function getTimeZoneOffset(date, tz) {
    const tzDate = relativeTime(date, tz);
    const zDate = relativeTime(date, getTimeZone());
    return zDate.getTime() - tzDate.getTime();
}
function relativeTime(date, timeZone) {
    const parts = {};
    const format = new Intl.DateTimeFormat("en-US", {
        year: "numeric",
        month: "2-digit",
        day: "2-digit",
        hour: "2-digit",
        minute: "2-digit",
        second: "2-digit",
        timeZone,
        hourCycle: "h23",
    });
    for (const part of format.formatToParts(date)) {
        parts[part.type] = part.value;
    }
    return new Date(`${parts.year}-${parts.month}-${parts.day}T${parts.hour}:${parts.minute}:${parts.second}Z`);
}
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