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POJavascript getDay returning incorrect values for April, June, September, November
 

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    <p>I'm using this script located here: <a href="http://www.javascriptkit.com/script/script2/dyndateselector.shtml" rel="noreferrer">http://www.javascriptkit.com/script/script2/dyndateselector.shtml</a></p> <p>If you try it, and go to any of April, June, September or November, you will notice that the day of the week columns are incorrect. Here's a list of incorrect data (the x starts y stuff is showing the following month.)</p> <p>Bugged months: 4/April (starts Sunday instead of Friday) May starts Sunday</p> <p>6/June (starts Friday instead of Wednesday) July starts Friday</p> <p>9/September (starts Saturday instead of Thursday) October starts Saturday</p> <p>11/November (starts Thursday instead of Tuesday) December starts Thursday</p> <p>You'll notice that every bugged month is starting with the day of the following month, yet all the other months seem to be correct.</p> <p>I can't find anything on this problem. Anyone able to help? The actual Javascript alone can be found here, and the getDay() method occurs on line 125: <a href="http://pastebin.com/0zuBYrzv" rel="noreferrer">http://pastebin.com/0zuBYrzv</a></p> <p>I've tested in both Firefox and Chrome.</p> <p>Here's some very simple code to demonstrate the issue:</p> <pre><code>&lt;script&gt; var d = new Date(); d.setMonth(5); d.setFullYear(2011); d.setDate(1); alert(d.getDay()); &lt;/script&gt; </code></pre> <p>This will create an alert with the message "5", meaning Friday (5+1 = 6, Friday is the 6th day of the week,) when in fact Wednesday is the start of the week.</p>
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    1. COPlease note when I use 4/April, it is taken into account, and if you Ctrl+F the script you will see (m - 1), so it gets changed to 3.
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