parseInt("08") returns 0 [duplicate]

Question

Possible Duplicate:
Workarounds for JavaScript parseInt octal bug

I've been working on a javascript function, setting date objects by declaring the year, month & date. However, when the month has a value of 08 or 09, 0 is returned when using parseInt(). See below:

parseInt("01") //returns 1
parseInt("02") //returns 2
parseInt("03") //returns 3
parseInt("04") //returns 4
parseInt("05") //returns 5
parseInt("06") //returns 6
parseInt("07") //returns 7
parseInt("08") //returns 0?
parseInt("09") //returns 0?
parseInt("10") //returns 10

I've created a jsFiddle to demonstrate this issue:

http://jsfiddle.net/GhkEf/

Why does parseInt("08") and parseInt("09") return 0?

Answer 1

That's because numbers started with 0 are considered to be octal. And 08 is a wrong number in octal.

Use parseInt('09', 10); instead.

Answer 2

It's being parsed as an octal number. Use the radix parameter in parseInt.

parseInt('08', 10);

An update: As of ES5, browsers should not have this bug. Octal literals require to be in the form 0o12 to be considered Octal numbers. 08 by default is now considered a decimal number in ES5, however, all browsers may not support this yet, so you should continue to pass the radix parameter to parseInt