JavaScript date comparison [duplicate]

Question

Possible Duplicate:
Compare 2 dates with JavaScript

I haven't done much JavaScript. I am trying to compare two dates. From jconsole:

a = ["01/01/2010","01/02/2010","01/03/2010"]

date1 = new Date('01/02/2010')
Sat Jan 02 2010 00:00:00 GMT-0800 (PST)

date2 = new Date(a[1])
Sat Jan 02 2010 00:00:00 GMT-0800 (PST)

date1 == date2
false

Can someone tell me why this does not match?

It is interesting to note that both >= and <= return true in this case, but == gives false. Another JavaScript miracle. — Kobi
– Kobi, Commented May 2, 2010 at 5:37

Daniel Vassallo · Accepted Answer · 2010-05-02 05:34:31Z

38

Your comparison is returning false because date1 and date2 are simply references to different objects, and you are actually comparing these references.

To do a proper comparison of the date values, you can use the getTime() method as follows:

date1.getTime() === date2.getTime();   // returns true

answered May 2, 2010 at 5:34

Daniel Vassallo

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2 Comments

user290870 Over a year ago

okay thanks. So '===' also compares type. Do '<=' and '>=' also compare type?

Daniel Vassallo Over a year ago

@ash34: Yes it is generally recommended to use === instead of ==. You may also want to check out this reference: developer.mozilla.org/en/Core_JavaScript_1.5_Reference/…. First of all note the part where it says: "Two objects are strictly equal if they refer to the same Object."... Also check the description of the different comparison operators.

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