Simple function to check if a given date falls within a given time span.

Code contains a fully functional illustrative example. Just change the commenting as instructed in the file to run the example. It's a matter of changing a single character (from '/' to '*').

Useful for determining, say, if a date a user has entered falls during your vacation?;)

By : dsilvia

<?php
/*
* (c) 2006, D.E. Silvia, All rights reserved.
* This code is available for use for non-commercial purposes.
* Free to distribute as long as this copyright information remains intact.
* No modification is authorized. Please, refer bugs/enhancements to
* dsilvia@mchsi.com
*
*/

/*
* Simple function to check if a given date falls within a given time span.
*
* Arguments are arrays of the form array(dayNum,monthNum,yearNum) as recognized
* by the standard php function mktime().
*
* Example:
* A simple illustrator to show how the functions are used.
*
* btw, ES|es stands for 'Epoch Seconds'
*
replace first character, single line comment character slash ('/'),
with multiline comment character star ('*')
in the line below to use the test code
//?>

<?php
include_once('DateSpan.php');
$startDate=array(1,1,2006);
$endDate=array(1,1,2007);
$find[0]=array(1,8,2007);
$find[1]=array(4,8,2006);
$esTime1=dateAryEStime($startDate);
$esTime2=dateAryEStime($endDate);
$date1=date("M-d-Y",$esTime1);
$date2=date("M-d-Y",$esTime2);
for($i=0; $i < 2; $i++)
{
$date3=date("M-d-Y",dateAryEStime($find[$i]));
if(dateBetween($startDate,$endDate,$find[$i]))
{
print("$date3 falls between $date1 and $date2 (inclusive)<br />");
}
else
{
print("$date3 falls outside $date1 and $date2 (inclusive)<br />");
}
}
?>

<?php /*
*
*/


function dateBetween($start,$end,$theDate)
{
$startES=dateAryEStime($start);
$endES=dateAryEStime($end);
$findES=dateAryEStime($theDate);
return ($startES <= $findES && $findES <= $endES);
}

function dateAryEStime($theDate)
{
return dateEStime($theDate[0],$theDate[1],$theDate[2]);
}

function dateEStime($theDay,$theMonth,$theYear)
{
return mktime(0,0,0,$theMonth,$theDay,$theYear);
}
?>

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