How to get correct date and month on node.js and Cloud Functions for Firebase?

Question

I am using plain javascript on a node server used on Cloud Functions for Firebase. json name is : trial.json

[{
    "date": "0822",
    "message": "Have a nice day on 0822"
 },
 {
    "date": "0823",
    "message": "Have a nice day on 0823"
 },
 {
    "date": "0824",
    "message": "Have a nice day on 0824"
 },
 {
    "date": "0825",
    "message": "Have a nice day on 0825"
 },
 {
    "date": "0826",
    "message": "Have a nice day on 0826"
 },
 {
    "date": "0827",
    "message": "Have a nice day on 0827"
 },
 {
    "date": "0828",
    "message": "Have a nice day on 0828"
 },
 {
    "date": "0829",
    "message": "Have a nice day on 0829"
 },
 {
    "date": "0830",
    "message": "Have a nice day on 0830"
 },
 {
    "date": "0831",
    "message": "Have a nice day on 0831"
 }]

the index.js is

var fs = require("fs");
var contents = fs.readFileSync("trial.json");
var jsonContent = JSON.parse(contents);
console.log("Content", jsonContent)
var today = month + date;
var currentDate;
var selectedCeleb = 0;

for (var index = 0; index < jsonContent.length; ++index) {
  var curr = jsonContent[index];
  if(curr.date == today){
      currentDate = curr;
      break;
  }
}
console.log("message : " + currentDate.message)
// Request Response Pair
exports.myApp = functions.https.onRequest((request, response) => {
  const app = new App({ request, response });
  console.log('Request headers: ' + JSON.stringify(request.headers));
  console.log('Request body: ' + JSON.stringify(request.body));

function getDayMessage() {
  return currentDate.message;
}

function userMessage (app) {
  let dayMsg = getDayMessage();
  if (app.hasSurfaceCapability(app.SurfaceCapabilities.SCREEN_OUTPUT)) {
      app.ask(app.buildRichResponse()
        .addSimpleResponsedayMsg))
    } else {
        app.ask(dayMsg, NO_INPUTS);    
    }
 }

  let actionMap = new Map();
  actionMap.set(USER_INTERESTED, userMessage);
  app.handleRequest(actionMap);
});

The value returned for month + day on my local is 0829 while on the server is 0827.

Please help to identify if it would be settings issue or code issue so that I can update the code to get right values.

Answer 1

Your local machine is probably in a different timezone than the servers running Cloud Functions. When you use getMonth() and getDate() on a Date object, they will return those values in your local time, which could be a different date than other timezones around the world.

getTimezoneOffset() will give you the number of minutes your timezone is offset from UTC:

new Date().getTimezoneOffset()

I live in California in Pacific Standard Time, so on my local machine that returns 420.

Cloud Functions servers are set to UTC, so that function returns 0.

What does return for your machine? Probably some value that puts you in a different date for most of the day, compared to Cloud Functions servers. The "correct" date is dependent on your timezone. If you want a specific timezone, you'll have to do some math with the Date object to get the values you're looking for.

Answer 2

DougStevenson: Not sure what explanation would be but just downgrading to Spark it works correctly. So whatever this blaze (Pay as you go) is doing is causing the issue. I would certainly keep it open and take up later.