vs new Date().getTime() vs +new Date

JavaScript performance comparison

Revision 11 of this test case created by Jamie Pate

Preparation code

if (!('now' in Date)) { = function() { return new Date().getTime();}
Date.now2 = function() { return +(new Date);}

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
new Date().getTime()
new Date().getTime()
+new Date
+new Date
parentheses 1
(new Date).getTime()
parentheses 2
(new Date()).getTime()
new Date().valueOf()
+(new Date) shim

Compare results of other browsers


You can edit these tests or add even more tests to this page by appending /edit to the URL.


vsync commented :

The results are drastically different between FF 32 and Chrome 38. FF outperforms Chrome in the fastest case, which is "".

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