Date object creation fails in JavaScript

Question

I'm getting very strange error in JavaScript.

var stamp = 1349102;
var obj = {a: stamp, b: new Date(stamp), c: new Date(1349102)};

When I look into obj - b says invalid Date but c is valid Date object.

Please help me. I really don't know how to solve this issue.

Works for me, without the extra left paren: obj.b.toString() === obj.c.toString() — Will Klein
– Will Klein, Commented Feb 24, 2013 at 20:23
well, the stamp var isnt constant, its value comes from input — Tomáš Blatný
– Tomáš Blatný, Commented Feb 24, 2013 at 20:26

Tom · Accepted Answer · 2013-02-24 21:05:23Z

1

If stamp is provided by a user, it can be considered as string. In that case your code would be interpreted by a browser as the following code (which does not work):

var stamp = "1349102";
var obj = {a: stamp, b: new Date(stamp), c: new Date(1349102)};

Convert stamp to Number and it will be fine

var stamp = "1349102";
var obj = {a: stamp, b: new Date(Number(stamp)), c: new Date(1349102)};

See the console output: first is without Number conversion, second is with Number conversion.

JSON Console Output

edited Feb 24, 2013 at 21:05

answered Feb 24, 2013 at 20:45

Tom

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1 Comment

Tomáš Blatný Over a year ago

Thanks, this was the problem ;)

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