CODEWITHSUNDEEP
javascriptfirebasedatetimegoogle-cloud-firestoregoogle-cloud-functions
Francesco
Francesco

Reputation: 189

firebase: date object methods return the wrong values

I'm trying to decompose a date I got from Firestore. Here's the source code:

exports.computeStatistics = functions.https.onRequest((request, response) => {
    let validatedViolations = [];
    const getValidatedViolations = db.collection("violations").where("validated", "==", true).get().then(snapshot => {
        return snapshot.forEach(doc => {
            validatedViolations.push({
                type: doc.data().type,
                date: doc.data().date.toDate()
            });
        })
    });

    getValidatedViolations.then(snapshot =>{
        return console.log(validatedViolations[0].date.getMonth(),validatedViolations[0].date.getDay());
    })

});

the date value is the following:

2019-11-14T00:00:00.000Z

but the outputs of the getMonth() and getDay() methods are respectively 10, 4 which are wrong. What's the problem? Thank you.

Upvotes: 0

Views: 189

Answers (1)

Renaud Tarnec
Renaud Tarnec

Reputation: 83181

Actually, what you get is "correct", in the sense that it corresponds to your code:

As explained here, getMonth():

returns the month in the specified date according to local time, as a zero-based value (where zero indicates the first month of the year).

and, as explained here, getDay():

returns the day of the week for the specified date according to local time, where 0 represents Sunday.

....

An integer number, between 0 and 6, corresponding to the day of the week for the given date, according to local time: 0 for Sunday, 1 for Monday, 2 for Tuesday, and so on

Since, November the 14th 2019 is a Thursday you get 10 (11 - 1) and 4.

Instead of getDay() you should use getDate(), and you should note that with getMonth(), zero indicates the first month of the year.

Upvotes: 2

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