Date/Time Functions
Here is function that checks date if matches given format and validity of the date.
<?php
/**
* Checks date if matches given format and validity of the date.
* Examples:
* <code>
* is_date('22.22.2222', 'mm.dd.yyyy'); // returns false
* is_date('11/30/2008', 'mm/dd/yyyy'); // returns true
* is_date('30-01-2008', 'dd-mm-yyyy'); // returns true
* is_date('2008 01 30', 'yyyy mm dd'); // returns true
* </code>
* @param string $value the variable being evaluated.
* @param string $format Format of the date. Any combination of <i>mm<i>, <i>dd<i>, <i>yyyy<i>
* with single character separator between.
*/
function is_date($value, $format = 'mm.dd.yyyy'){
if(strlen($value) == 10 && strlen($format) == 10){
// find separator. Remove all other characters from $format
$separator_only = str_replace(array('m','d','y'),'', $format);
$separator = $separator_only[0]; // separator is first character
if($separator && strlen($separator_only) == 2){
// make regex
$regexp = str_replace('mm', '[0-1][0-9]', $value);
$regexp = str_replace('dd', '[0-3][0-9]', $value);
$regexp = str_replace('yyyy', '[0-9]{4}', $value);
$regexp = str_replace($separator, "\\" . $separator, $value);
if($regexp != $value && preg_match('/'.$regexp.'/', $value)){
// check date
$day = substr($value,strpos($format, 'd'),2);
$month = substr($value,strpos($format, 'm'),2);
$year = substr($value,strpos($format, 'y'),4);
if(@checkdate($month, $day, $year))
return true;
}
}
}
return false;
}
?>
checkdate
(PHP 4, PHP 5)
checkdate — Validate a Gregorian date
Description
bool checkdate
( int $month
, int $day
, int $year
)
Checks the validity of the date formed by the arguments. A date is considered valid if each parameter is properly defined.
Parameters
- month
-
The month is between 1 and 12 inclusive.
- day
-
The day is within the allowed number of days for the given month . Leap year s are taken into consideration.
- year
-
The year is between 1 and 32767 inclusive.
Return Values
Returns TRUE if the date given is valid; otherwise returns FALSE.
Examples
Example #1 checkdate() example
<?php
var_dump(checkdate(12, 31, 2000));
var_dump(checkdate(2, 29, 2001));
?>
The above example will output:
bool(true) bool(false)
add a note
User Contributed Notescheckdate
bmauser at gmail
16-Dec-2008 02:24
16-Dec-2008 02:24
parris dot varney at gmail dot com
11-Dec-2008 03:24
11-Dec-2008 03:24
I put together an is_date function using checkdate. Works the same as is_numeric.
<?php
public static function is_date($date)
{
$date = str_replace(array('\'', '-', '.', ','), '/', $date);
$date = explode('/', $date);
if( count($date) == 1 // No tokens
and is_numeric($date[0])
and $date[0] < 20991231 and
( checkdate(substr($date[0], 4, 2)
, substr($date[0], 6, 2)
, substr($date[0], 0, 4)))
)
{
return true;
}
if( count($date) == 3
and is_numeric($date[0])
and is_numeric($date[1])
and is_numeric($date[2]) and
( checkdate($date[0], $date[1], $date[2]) //mmddyyyy
or checkdate($date[1], $date[0], $date[2]) //ddmmyyyy
or checkdate($date[1], $date[2], $date[0])) //yyyymmdd
)
{
return true;
}
return false;
}
?>
doob_ at gmx dot de
26-Nov-2008 04:47
26-Nov-2008 04:47
<?php
/*
** check a date
** dd.mm.yyyy || mm/dd/yyyy || dd-mm-yyyy || yyyy-mm-dd
*/
function check_date($date) {
if(strlen($date) == 10) {
$pattern = '/\.|\/|-/i'; // . or / or -
preg_match($pattern, $date, $char);
$array = preg_split($pattern, $date, -1, PREG_SPLIT_NO_EMPTY);
if(strlen($array[2]) == 4) {
// dd.mm.yyyy || dd-mm-yyyy
if($char[0] == "."|| $char[0] == "-") {
$month = $array[1];
$day = $array[0];
$year = $array[2];
}
// mm/dd/yyyy # Common U.S. writing
if($char[0] == "/") {
$month = $array[0];
$day = $array[1];
$year = $array[2];
}
}
// yyyy-mm-dd # iso 8601
if(strlen($array[0]) == 4 && $char[0] == "-") {
$month = $array[1];
$day = $array[2];
$year = $array[0];
}
if(checkdate($month, $day, $year)) { //Validate Gregorian date
return TRUE;
} else {
return FALSE;
}
}else {
return FALSE; // more or less 10 chars
}
}
check_date('21.02.1983');
check_date('21-02-1983');
check_date('02/21/1983'); // Common U.S. writing
check_date('1983-02-21'); // iso 8601
?>
saturn at ax dot com dot tw
26-Aug-2008 06:06
26-Aug-2008 06:06
I wrote a simple function to converter datetime to UNIX timestamp. If the input time with error format, the function will return current timestamp.
<?php
function datetime2timestamp($datetime)
{
$datetime = str_replace('-', ' ', $datetime);
$datetime = str_replace('/', ' ', $datetime);
$datetime = str_replace(':', ' ', $datetime);
$array = explode(' ', $datetime);
$year = $array[0];
$month = $array[1];
$day = $array[2];
$array[3] ? $hour = $array[3] : $hour = '00';
$array[4] ? $minute = $array[4] : $minute = '00';
$array[5] ? $second = $array[5] : $second = '00';
if (preg_match("/^(\d{4}) (\d{2}) (\d{2}) ([01][0-9]|2[0-3]) ([0-5][0-9]) ([0-5][0-9])$/", "$year $month $day $hour $minute $second", $matches)) {
if (checkdate($matches[2], $matches[3], $matches[1])) {
return mktime(intval($hour), intval($minute), intval($second), intval($month), intval($day), intval($year));
} else {
return time();
}
} else {
return time();
}
}
?>
el dot vartauy__ at t__gmail dot com
29-Feb-2008 06:18
29-Feb-2008 06:18
for funny leap year detection:
<?php
function is_leap($year=NULL) {
return checkdate(2, 29, ($year==NULL)? date('Y'):$year); // true if is a leap year
}
?>
wasile_ro[at]yahoo[dot]com
08-Oct-2007 02:30
08-Oct-2007 02:30
here's a cool function to validate a mysql datetime:
<?php
function isValidDateTime($dateTime)
{
if (preg_match("/^(\d{4})-(\d{2})-(\d{2}) ([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])$/", $dateTime, $matches)) {
if (checkdate($matches[2], $matches[3], $matches[1])) {
return true;
}
}
return false;
}
?>
jens wittmann
28-Aug-2007 03:29
28-Aug-2007 03:29
for checking the rime use this:
<?php
function checktime($hour, $minute) {
if ($hour > -1 && $hour < 24 && $minute > -1 && $minute < 60) {
return true;
}
}
?>
brenig code
14-Aug-2007 06:21
14-Aug-2007 06:21
<?php
/**
* check a date combo of the 2
*/
function checkData($date)
{
if (!isset($date) || $date=="")
{
return false;
}
list($dd,$mm,$yy)=explode("/",$date);
if ($dd!="" && $mm!="" && $yy!="")
{
if (is_numeric($yy) && is_numeric($mm) && is_numeric($dd))
{
return checkdate($mm,$dd,$yy);
}
}
return false;
}
?>
a34 at yahoo dot com
09-Jul-2007 12:21
09-Jul-2007 12:21
checkData function posted below does not consider a date entered such as 03/27c/2000. The c will cause it to crash. Here is the fix.
<?php
function checkData($mydate) {
list($yy,$mm,$dd)=explode("-",$mydate);
if (is_numeric($yy) && is_numeric($mm) && is_numeric($dd))
{
return checkdate($mm,$dd,$yy);
}
return false;
}
?>
manuel84**at**mp4**dot**it
04-Dec-2006 03:49
04-Dec-2006 03:49
If you have a date like this gg/mm/aaaa and you'd like to verify that it is in the Italian Format you can use a function like this.
For other date format you can take this code and simply modify the list and explode line
<?php
/**
* check a date in the Italian format
*/
function checkData($date)
{
if (!isset($date) || $date=="")
{
return false;
}
list($dd,$mm,$yy)=explode("/",$date);
if ($dd!="" && $mm!="" && $yy!="")
{
return checkdate($mm,$dd,$yy);
}
return false;
}
?>