...

View Full Version : How many Days in a Month



Dormilich
06-05-2012, 07:06 AM
based on felgallís idea (http://www.codingforums.com/showpost.php?p=1229722&postcount=2):

function daysInAMonth(month, year)
{
return (32 - new Date(year, month-1, 32).getDate());
}

xelawho
06-05-2012, 07:20 AM
why not just


function DaysInMonth(yr,mth) {
return new Date(yr,mth,0).getDate();
}
?

Dormilich
06-05-2012, 07:26 AM
interesting, never thought to use underflow.

felgall
06-05-2012, 08:07 AM
based on felgallís idea (http://www.codingforums.com/showpost.php?p=1229722&postcount=2)

At least that post of mine got you thinking about it even if you didn't quite get to the simplest solution.

Philip M
06-05-2012, 08:30 AM
Just for the record:-


<script type = "text/javascript">

Date.prototype.daysinMonth=function(){
var d = new Date(this.getFullYear(), this.getMonth()+1, 0);
return d.getDate();
}

var d = new Date();
alert("Number of days in this month:- " + d.daysinMonth());

var Mth = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
var i = 0;
var yr = 2012;
var Arr = [];
var dt = new Date(yr, 0, 1);
while(i < 12) {
Arr[i]= Mth[i]+' has '+dt.daysinMonth()+' days';
dt.setMonth(++i);
}

alert('Days in each Month of '+yr+'\n\t'+Arr.join('\n\t'))

</script>

Dormilich
06-05-2012, 09:08 AM
At least that post of mine got you thinking about it even if you didn't quite get to the simplest solution.

itís still considerably shorter than anything I had seen until then. but nevertheless, your leap year solution got me thinking how to tackle this problem in the not-so-obvious way.

@Philipp_M: I also considered extending Date, but left it to the reader (i.e. you) as it should pose no problem to rewrite it.



EZ Archive Ads Plugin for vBulletin Copyright 2006 Computer Help Forum