Generate BLE standard compliant org.bluetooth.characteristic.current_time characteristic value

ble_current_time.js

/**
 * Generate a BLE compliant org.bluetooth.characteristic.current_time characteristic value
 *
 * @param {Date} date
 * @param {Number} reason
 */
function getBleTime(date, reason = 1) {
    let str = "";

    str += date.getFullYear().toString(16).padStart(4, "0").match(/[a-fA-F0-9]{2}/g).reverse().join('');
    str += (date.getMonth() + 1).toString(16).padStart(2, "0");
    str += date.getDate().toString(16).padStart(2, "0");
    str += date.getHours().toString(16).padStart(2, "0");
    str += date.getMinutes().toString(16).padStart(2, "0");
    str += date.getSeconds().toString(16).padStart(2, "0");
    str += date.getDay().toString(16).padStart(2, "0");
    str += (Math.floor(date.getMilliseconds() * 255 / 1000)).toString(16).padStart(2, "0");
    str += (reason).toString(16).padStart(2, "0");

    return str;
}