How to compare two timestamp values in javascript?

Question

I need to compare two timestamp values one is retrieving from the database and the other is the constant date which is the default value.

 var userdate = doc.data().Subscriptionenddatefrombackend;// the value here I am getting is : 2020-03-02T09:49:05.000Z
 var settingdate = new Date('2019/03/04'); // the value here I am getting is : 2019-03-04T00:00:00.000Z

 if(settingdate < userdate){
    console.log("new user") // the code enters into this loop instead of else loop why?
 }
 else{
    console.log("old user") // should print this line
 }

So, what's not working there? both dates seem to be actual date objects... — Cerbrus, Mar 05 '20 at 11:49
@Jamiec - Datatype of " Subscriptionenddatefrombackend" is timestamp. — Sravya Gajavalli, Mar 05 '20 at 11:51
It is the datatype in my backend(Firestore) and please go through the edited question. — Sravya Gajavalli, Mar 05 '20 at 11:57
first check your both date are instanceof Date specially first one — Shekhar Khairnar, Mar 05 '20 at 11:58

score 1 · Answer 1 · answered Mar 05 '20 at 11:50

1

You are doing a comparison operation on an object and a string.

userdate is a string, and settingdate is an object.

You should try creating a new Date object from the userdate string.

let userdate = new Date( doc.data().Subscriptionenddatefrombackend )

answered Mar 05 '20 at 11:50

Chris L

129
5

It's not working – Sravya Gajavalli Mar 05 '20 at 12:05

score 0 · Answer 2 · answered Mar 05 '20 at 11:48

0

You can parse it to create an instance of Date and use the built-in comparators: Convert userdate to a Date object also settingsdate is already a date object.

new Date(userdate) > settingsdate
new Date(userdate) < settingsdate

answered Mar 05 '20 at 11:48

joy08

9,004
8
38
73

It is not working – Sravya Gajavalli Mar 06 '20 at 03:22

Mechanic · Answer 3 · 2020-03-05T11:57:27.063

0

by using Date.parse() :

var userdate = doc.data().Subscriptionenddatefrombackend;// the value here I am getting is : 2020-03-02T09:49:05.000Z
var settingdate = new Date('2019/03/04'); // the value here I am getting is : 2019-03-04T00:00:00.000Z

if(settingdate.getTime() < Date.parse(userdate)){
   console.log("new user") // the code enters into this loop instead of else loop why?
}
else{
   console.log("old user") // should print this line
}

edited Mar 05 '20 at 11:57

answered Mar 05 '20 at 11:49

Mechanic

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4
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No point in parsing `settingdate`. That's already a Date object. – Cerbrus Mar 05 '20 at 11:50
@Cerbrus date parse return `A number representing the milliseconds elapsed since 1970` so we can compare two numbers; I'm not going compare two date object, here we are comparing two `number` – Mechanic Mar 05 '20 at 11:53
1

So use `.getTime()` for the existing date object. – Cerbrus Mar 05 '20 at 11:55
@Cerbrus yeah, that makes sense; updated(); – Mechanic Mar 05 '20 at 11:58

How to compare two timestamp values in javascript?

3 Answers3