How do I check if a date is a holiday?

[funphp]

Let say we have three holidays in a year, that's New Year Day (01/01), Independence Day (01/04), and Christmas Day (12/25). If a user enters a date, I want to check whether the input date is a holiday or not. Note that the dates are written in the United States format (month/day). I need to use the timestamp to compare the dates.

[RussellReal]

an array?

 

 

<?php
$day = date('M-d');
$holidays = array(
	'01-01',
	'01-04',
	'12-25'
);

if (in_array($day,$holidays)) // its a holiday!!
else // awww :'(
?>

[Mark Baker]

Let say we have three holidays in a year, that's New Year Day (01/01), Independence Day (01/04), and Christmas Day (12/25). If a user enters a date, I want to check whether the input date is a holiday or not. Note that the dates are written in the United States format (month/day). I need to use the timestamp to compare the dates.

01/04 should be 07/04

 

Russell's method works with holidays that fall on the same date each year, but you'd need to build the array dynamically for other holidays that fall on a different date each year (e.g. Memorial Day, Easter Monday, Thanksgiving) where you need to know the year.

 

Easter is difficulat because it's based on a lunar calendar, but the easter_days() and easter_date]easter_date() may be useful if you need to work out the date for the Easter holidays, and there's a function in the notes that allows you to work out Easter in the Eastern Orthodox calendar if you need that.

 

[R3D_H4T]

<?php

/* Canadian Holiday Calculations in PHP

* Version 1.00

* by Devin Ryan <r3d_h4t@hotmail.com>

* Last Modified: November 3, 2009

* ------------------------------------------------------------------------

* The holiday calculations on this page were assembled for

* use in a time keeping program for work

*

* USE THIS LIBRARY AT YOUR OWN RISK; no warranties are expressed or

* implied. You may modify the file however you see fit, so long as

* you retain this header information and any credits to other sources

* throughout the file.  If you make any modifications or improvements,

* please send them via email to Devin Ryan <r3d_h4t@hotmail.com>.

* ------------------------------------------------------------------------

*/

function holiday($date)

{

$year = substr($date, 0, 4);

$holiday = '';

if ($date == $year.'-01-01')

{

$holiday = 'New Years Day';

}

if ($date == date("Y-m-d", strtotime($year.'-02-00, third monday')))

{

$holiday = 'Family Day';

}

if ($date == date("Y-m-d", strtotime("-2 days", (easter_date($year)))))

{

$holiday = 'Good Friday';

}

if ($date == date("Y-m-d", strtotime($year.'-05-25, last monday')))

{

$holiday = 'Victoria Day';

}

if ($date == $year.'-07-01')

{

$holiday = 'Canada Day';

}

if ($date == date("Y-m-d", strtotime($year.'-08-00, first monday')))

{

$holiday = 'Civic Holiday';

}

if ($date == date("Y-m-d", strtotime($year.'-09-00, first monday')))

{

$holiday = 'Labour Day';

}

if ($date == date("Y-m-d", strtotime($year.'-10-00, second monday')))

{

$holiday = 'Thanksgiving Day';

}

if ($date == $year.'-12-25')

{

$holiday = 'Christmas';

}

if ($date == $year.'-12-26')

{

$holiday = 'Boxing Day';

}

return $holiday;

}

if (!$_GET["date"])

{

    $_GET["date"] = date("Y-m-d");

}

$date = $_GET["date"];

echo "<form action=\"\" method=\"get\">

<b>Enter date in format YYYY-MM-DD:</b> <input type=\"text\" name=\"date\" value=\"".$_GET["date"]."\" size=\"10\" maxlength=\"10\">

<input type=\"submit\" value=\"Go\">

</form>";

echo "<h1>".holiday($date)."</h1>";

?>

[Philip]

I think a switch would be better suited for this, since you would only have one case:

 

<?php 
/* Canadian Holiday Calculations in PHP
* Version 1.00
* by Devin Ryan <r3d_h4t@hotmail.com>
* Last Modified: November 3, 2009
* ------------------------------------------------------------------------
* The holiday calculations on this page were assembled for
* use in a time keeping program for work
* 
* USE THIS LIBRARY AT YOUR OWN RISK; no warranties are expressed or
* implied. You may modify the file however you see fit, so long as
* you retain this header information and any credits to other sources
* throughout the file.  If you make any modifications or improvements,
* please send them via email to Devin Ryan <r3d_h4t@hotmail.com>.
* ------------------------------------------------------------------------
*/
function holiday($date) {    
  
   $year = substr($date, 0, 4); 
   
   switch($date) {
   
	case $year.'-01-01':
		$holiday = 'New Years Day';
	break;

	case date("Y-m-d", strtotime($year.'-02-00, third monday')):
		$holiday = 'Family Day';
	break;

	case date("Y-m-d", strtotime("-2 days", (easter_date($year)))):
		$holiday = 'Good Friday';
	break;

	case date("Y-m-d", strtotime($year.'-05-25, last monday')):
		$holiday = 'Victoria Day';
	break;

	case $year.'-07-01':
		$holiday = 'Canada Day';
	break;

	case date("Y-m-d", strtotime($year.'-08-00, first monday')):
		$holiday = 'Civic Holiday';
	break;

	case date("Y-m-d", strtotime($year.'-09-00, first monday')):
		$holiday = 'Labour Day';
	break;

	case date("Y-m-d", strtotime($year.'-10-00, second monday')):
		$holiday = 'Thanksgiving Day';
	break;

	case $year.'-12-25':
		$holiday = 'Christmas';
	break;

	case $year.'-12-26':
		$holiday = 'Boxing Day';
	break;

	default:
		$holiday = 'Normal Day';

}

return $holiday;
}
if (!$_GET["date"]) 
   {
    $_GET["date"] = date("Y-m-d");
   }
$date = $_GET["date"];
echo "<form action=\"\" method=\"get\">
<b>Enter date in format YYYY-MM-DD:</b> <input type=\"text\" name=\"date\" value=\"".$_GET["date"]."\" size=\"10\" maxlength=\"10\">
<input type=\"submit\" value=\"Go\">
</form>";
echo "<h1>".holiday($date)."</h1>"; 
?>