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JavaScript to get the last day of the month code

Source: Internet
Author: User
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The simplest code

The code is as follows Copy Code

<script type= "Text/javascript" >
<!--
document.write (New Date (2009, 4, 1)); The 1th Day of May 2009 (the January value is 0), May 1, 2009
document.write (New Date (2009, 5, 0)); The No. 0 Day of June 2009, the last day of May 2009
-->
</script>


Another way of writing

The code is as follows Copy Code

<title> title page </title>
<script language= "JavaScript" >
function Getlastday (year,month)
{
var new_year = year; Take the current year
var new_month = month++;//Remove the first day of one months for easy calculation (last day is not fixed)
if (month>12)//If the current is greater than December, the year is transferred to the next year
{
New_month-=12; Month minus
new_year++; Year increase
}
var new_date = new Date (new_year,new_month,1); Take the first day of the current month
Return (new Date (New_date.gettime () -1000*60*60*24)). GetDate ()//Get the date of the last day of the month
}
</script>
<body>
<input id= "Button1" type= "button" value= "Take the last day of May 2007" onclick= "Alert (Getlastday (2007,5))"/>
</body>

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