如何检查 Firebase 是否过了一天？

Question

我已将此时间戳保存在 Firestore 文档中：

last_check_mmr: 14 dicembre 2021 15:39:01 UTC+1

如何使用 Javascript 检查该日期是否已经过了一天？

Answer 1

由于您使用 Cloud Function，因此使用 Dayjs“解析、验证、操作和显示日期的极简主义 JavaScript 库”非常容易。

像下面这样的东西，使用 diff() 方法，应该可以解决问题：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

const dayjs = require('dayjs');

// Let's imagine you use a scheduled Cloud Funciton
exports.scheduledFunction = functions.pubsub.schedule('...').onRun(async (context) => {

  // Get the value of the timestamp, e.g. by fetching a Firestore document
  
  const docRef = ...;
  const snap = await docRef.get();

  const last_check_mmr = snap.get('last_check_mmr');
  
  const date = dayjs(last_check_mmr.toDate());
  const now = dayjs();

  console.log(date.diff(now, 'd'));

  // If you get a value of 0, it means it is less than a day, if you get -1 or less it is more than a day

  if (date.diff(now, 'd') < 0) {
     // more than a day
  }

  return null;

});

如何检查 Firebase 是否过了一天？

How to check if a day has passed in Firebase?

javascript

date

firebase

google-cloud-functions

google-cloud-firestore