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Date Prototype Functions

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Submitted on: 9/2/2011 4:02:20 PM
By: codeprada  
Level: Advanced
User Rating: Unrated
Compatibility: JavaScript
Views: 2260
(About the author)
 
     Prototype functions that returns the day of the week which falls on either the beginning or end of the month.
 
code:
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'**************************************
' Name: Date Prototype Functions
' Description:Prototype functions that returns the day of the week which falls on either the beginning or end of the month.
' By: codeprada
'
'This code is copyrighted and has' limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=6716&lngWId=14'for details.'**************************************

<script type='text/javascript'>
/*
 *@return int Number of days in the month
 */
Date.prototype.getDaysInMonth = function()
{
	switch(this.getMonth())
	{
		case 0:
		case 2:
		case 4:
		case 6:
		case 7:
		case 9:
		case 11:
			return 31;
		case 1:
			return ( this.getFullYear() % 4 == 0 ? 29 : 28 );
		case 3:
		case 5:
		case 8:
		case 10:
			return 30;
		default:
			return 0;
	}
}
/*
 *@return int Day of the week which is the last day of the month
 */
Date.prototype.endOfMonthDay = function()
{
	var buf = ((this.getDaysInMonth() - this.getDate()) % 7) + this.getDay();
	return ( buf >= 7 ? buf % 7 : buf);
}
/*
 *@return int Day of the week which is the first day of the month
 */
Date.prototype.startOfMonthDay = function()
{
	var d = new Date((this.getMonth() == 0 ? this.getFullYear() - 1 : this.getFullYear()), 
							(this.getMonth() == 0 ? 11 : this.getMonth() - 1),
							this.getDate());
	return ( d.endOfMonthDay() + 1 );
}
</script>


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