zigbee2mqtt/lib/util/utils.js

// Xiaomi uses 4151 and 4447 (lumi.plug) as manufacturer ID.
const xiaomiManufacturerID = [4151, 4447];
const ikeaTradfriManufacturerID = [4476];

// construct a local ISO8601 string (instead of UTC-based)
// Example:
//  - ISO8601 (UTC) = 2019-03-01T15:32:45.941+0000
//  - ISO8601 (local) = 2019-03-01T16:32:45.941+0100 (for timezone GMT+1)
function toLocalISOString(dDate) {
    const tzOffset = -dDate.getTimezoneOffset();
    const plusOrMinus = tzOffset >= 0 ? '+' : '-';
    const pad = function(num) {
        const norm = Math.floor(Math.abs(num));
        return (norm < 10 ? '0' : '') + norm;
    };

    return dDate.getFullYear() +
        '-' + pad(dDate.getMonth() + 1) +
        '-' + pad(dDate.getDate()) +
        'T' + pad(dDate.getHours()) +
        ':' + pad(dDate.getMinutes()) +
        ':' + pad(dDate.getSeconds()) +
        plusOrMinus + pad(tzOffset / 60) +
        ':' + pad(tzOffset % 60);
}

module.exports = {
    millisecondsToSeconds: (milliseconds) => milliseconds / 1000,
    secondsToMilliseconds: (seconds) => seconds * 1000,
    isXiaomiDevice: (device) => xiaomiManufacturerID.includes(device.manufId),
    isIkeaTradfriDevice: (device) => ikeaTradfriManufacturerID.includes(device.manufId),
    isNumeric: (string) => /^\d+$/.test(string),
    toLocalISOString: (dDate) => toLocalISOString(dDate),
};