我需要向 admin.database.ServerValue.TIMESTAMP 添加時間，然后檢索它。但是當我嘗試添加額外的時間時，ServerValue.TIMESTAMP我收到錯誤：getTime 不是一個函數const functions = require('firebase-functions');const admin = require('firebase-admin');admin.initializeApp();const ten_secs = 10 * 1000; // 10 secondsconst daily_secs = 24 * 60 * 60 * 1000; // 24 hrsconst weekly_secs = 168 * 60 * 60 * 1000; // 1 weekexports.update = functions.https.onRequest((request, response) => {? ? const currentTimeStamp = admin.database.ServerValue.TIMESTAMP;? ? const updatedSecs = new Date(currentTimeStamp.getTime() + ten_secs); // should be saved in the db as milliseconds for later retrieve and calculations? ? const updatedDay = new Date(currentTimeStamp.getTime() + daily_secs); // should be saved in the db as milliseconds for later retrieve and calculations? ? const updatedWeek = new Date(currentTimeStamp.getTime() + weekly_secs); // should be saved in the db as milliseconds for later retrieve and calculations? ? console.log("updatedSecs: " + updatedSecs + " | updatedDay: " + updatedDay + " | updatedWeek: " + updatedWeek);? ? const ref = admin.database().ref('schedule').child("scheduleId_123").child("my_uid")? ? ref.once('value', snapshot => {? ? ? ? if (!snapshot.exists()) {? ? ? ? ? ? return ref.set({ "updatedSecs": updatedSecs, "updatedDay": updatedDay, "updatedWeek": updatedWeek });? ? ? ? } else {? ? ? ? ? ? const retrieved_updatedSecs = snapshot.child("updatedSecs").val();? ? ? ? ? ? const retrieved_updatedDay = snapshot.child("updatedDay").val();? ? ? ? ? ? const retrieved_updatedWeek = snapshot.child("updatedWeek").val();? ? ? ? ? ? const currentTime = Date.now();? ? ? ? ? ? // do some calculations with the above values and currentTime.? ? ? ? }? ? });}