checkdate

(PHP 4, PHP 5, PHP 7)

checkdate — 验证一个格里高里日期

说明

bool checkdate ( int $month , int $day , int $year )

检查由参数构成的日期的合法性。如果每个参数都正确定义了则会被认为是有效的。

参数

month: month 的值是从 1 到 12。
day: Day 的值在给定的 month 所应该具有的天数范围之内，闰年已经考虑进去了。
year: year 的值是从 1 到 32767。

返回值

如果给出的日期有效则返回 TRUE ，否则返回 FALSE 。

范例

Example #1 checkdate() 例子

  <?php
var_dump ( checkdate ( 12 ,  31 ,  2000 ));
 var_dump ( checkdate ( 2 ,  29 ,  2001 ));
 ?>

以上例程会输出：

bool(true)
bool(false)

参见

mktime() - 取得一个日期的 Unix 时间戳
strtotime() - 将任何英文文本的日期时间描述解析为 Unix 时间戳

用户评论:

[#1] SDSurfer [2014-10-16 16:07:52]

Super graceful solution by glavic and the mod by Bas - the only thing I would add is if you have user input, you have the potential for really munged up values for date which can throw exceptions. Add a try/catch:

    if (((int) $version[0] >= 5 && (int) $version[1] >= 2 && (int) $version[2] > 17)) {
        try {  $d = DateTime::createFromFormat($format, $date); }
catch (Exception $e) {
if ($debug) { echo "Invalid date: " . $e->getMessage() . "<br>\n"; }
return false;
}
    } else {
        try { $d = new DateTime(date($format, strtotime($date))); }
catch (Exception $e) {
if ($debug) { echo "Invalid date: " . $e->getMessage() . "<br>\n"; }
return false;
}
    }

[#2] Bas [2014-02-20 11:59:43]

And here is a version which will work for PHP 5.2 also.

function ValidateDate($date, $format = 'Y-m-d H:i:s') {
    $version = explode('.', phpversion());
    if (((int) $version[0] >= 5 && (int) $version[1] >= 2 && (int) $version[2] > 17)) {
        $d = DateTime::createFromFormat($format, $date);
    } else {
        $d = new DateTime(date($format, strtotime($date)));
    }
    return $d && $d->format($format) == $date;
}

[#3] jdiosdado [2013-12-04 21:54:01]

There is an issue with glavic at gmail dot com answer:

var_dump(validateDate('9/21/1943', ''m/d/Y''));

The result will be false. 09/21/1943 =! 9/21/1943

[#4] glavic at gmail dot com [2013-09-12 12:46:32]

With DateTime you can make the shortest date&time validator for all formats.

<?php

function validateDate($date, $format = 'Y-m-d H:i:s')
{
$d = DateTime::createFromFormat($format, $date);
return $d && $d->format($format) == $date;
}

var_dump(validateDate('2012-02-28 12:12:12')); # true
var_dump(validateDate('2012-02-30 12:12:12')); # false
var_dump(validateDate('2012-02-28', 'Y-m-d')); # true
var_dump(validateDate('28/02/2012', 'd/m/Y')); # true
var_dump(validateDate('30/02/2012', 'd/m/Y')); # false
var_dump(validateDate('14:50', 'H:i')); # true
var_dump(validateDate('14:77', 'H:i')); # false
var_dump(validateDate(14, 'H')); # true
var_dump(validateDate('14', 'H')); # true

var_dump(validateDate('2012-02-28T12:12:12+02:00', 'Y-m-d\TH:i:sP')); # true
# or
var_dump(validateDate('2012-02-28T12:12:12+02:00', DateTime::ATOM)); # true

var_dump(validateDate('Tue, 28 Feb 2012 12:12:12 +0200', 'D, d M Y H:i:s O')); # true
# or
var_dump(validateDate('Tue, 28 Feb 2012 12:12:12 +0200', DateTime::RSS)); # true
var_dump(validateDate('Tue, 27 Feb 2012 12:12:12 +0200', DateTime::RSS)); # false
# ...

[#5] admin at limitsizbilgi dot com [2013-07-16 14:40:00]

[#6] mohammed dot aas2012 at gmail dot com [2012-11-07 11:23:21]

format should be in array like: array("m","d","y")

<?php function isValidDate($strDate,$format,$ex) { $valid = false; if(is_array($format) && count($format) == 3 && count(explode($ex,$strDate))==3) { $date = array_combine($format,explode($ex,$strDate)); if(intval($date['m']) && intval($date['d']) && intval($date['y'])){ $m = $date['m']; $d = $date['d']; $y = $date['y']; $valid = checkdate($m,$d,$y); } } return $valid; } ?>

[#7] bharath.kishore.a AT gmail. DOT com [2012-03-07 14:00:13]

Here is another crooked way to check if given data is valid DATETIME or not.

function checkDateTime($data) {
    if (date('Y-m-d H:i:s', strtotime($data)) == $data) {
        return true;
    } else {
        return false;
    }
}

[#8] rfeugenio at gmail dot com [2009-03-26 22:21:19]

<?php // This is a simple function that will get the last day of the month. function GetLastDayofMonth($year, $month) { for ($day=31; $day>=28; $day--) { if (checkdate($month, $day, $year)) { return $day; } } } ?>

[#9] James Luckhurst [2009-03-22 16:26:44]

<?php function convertdate($s_date,$s_from,$s_to,$s_return_delimiter) { $s_return_date = ''; $s_from = strtolower($s_from); $s_to = strtolower($s_to); $s_date = str_replace(array('\'', '-', '.', ',', ' '), '/', $s_date); $a_date = explode('/', $s_date); switch($s_from) { case 'eng': # dd/mm/yyyy $day = $a_date[0]; $month = $a_date[1]; $year = $a_date[2]; break; case 'usa': # mm/dd/yyyy $month = $a_date[0]; $day = $a_date[1]; $year = $a_date[2]; break; case 'iso': # yyyy/mm/dd $year = $a_date[0]; $month = $a_date[1]; $day = $a_date[2]; break; default: # error message user_error('function convertdate(string $s_date, string $s_from, string $s_to, string $s_return_delimiter) $s_from not a valid type of \'eng\', \'usa\' or \'iso\''); return NULL; } # substitution fixes of valid alternative human input e.g. 1/12/08 if (strlen($day)==1) { $day='0'.$day; } # day -trailing zero missing if (strlen($month)==1) { $month='0'.$month; } # month -trailing zero missing if (strlen($year)==3) { $year=substr(date('Y'),0,strlen(date('Y'))-3).$year; } # year -millennium missing if (strlen($year)==2) { $year=substr(date('Y'),0,strlen(date('Y'))-2).$year; } # year -century missing if (strlen($year)==1) { $year=substr(date('Y'),0,strlen(date('Y'))-1).$year; } # year -decade missing switch($s_to) { case 'eng': # dd/mm/yyyy $s_return_date = $day.$s_return_delimiter.$month.$s_return_delimiter.$year; break; case 'usa': # mm/dd/yyyy $s_return_date = $month.$s_return_delimiter.$day.$s_return_delimiter.$year; break; case "iso": # yyyy/mm/dd $s_return_date = $year.$s_return_delimiter.$month.$s_return_delimiter.$day; break; default: # error message user_error('function convertdate(string $s_date, string $s_from, string $s_to, string $s_return_delimiter) $s_to not a valid type of \'eng\', \'usa\' or \'iso\''); return NULL; } # if it's an invalid calendar date e.g. 40/02/2009 or rt/we/garbage if (!is_numeric($month) || !is_numeric($day) || !is_numeric($year)) { return NULL; } elseif (!checkdate($month, $day, $year)) { return NULL; } return $s_return_date; } echo convertdate('13/04/2009','eng','iso','-'); ?>

[#10] ystein M [2009-03-18 05:51:56]

I think there is an error in the function from bmauser below. $regexp is overwritten. Here's another version which also accepts missing zeros and two digits year notation.

This function checks date if matches given format and validity of the date.

<?php function is_valid_date($value, $format = 'dd.mm.yyyy'){ if(strlen($value) >= 6 && 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?[1-9]|1[0-2])', $format); $regexp = str_replace('dd', '(0?[1-9]|[1-2][0-9]|3[0-1])', $regexp); $regexp = str_replace('yyyy', '(19|20)?[0-9][0-9]', $regexp); $regexp = str_replace($separator, "\\" . $separator, $regexp); if($regexp != $value && preg_match('/'.$regexp.'\z/', $value)){ // check date $arr=explode($separator,$value); $day=$arr[0]; $month=$arr[1]; $year=$arr[2]; if(@checkdate($month, $day, $year)) return true; } } } return false; } ?>

[NOTE BY danbrown AT php DOT net: Original function was written by (bmauser AT gmail) on 16-DEC-2008.]

[#11] sebagr@gmail [2009-03-04 09:20:29]

Here's a nice snippet to check if user input is valid:

<?php $date_format = 'Y-m-d'; $input = '2009-03-03'; $input = trim($input); $time = strtotime($input); $is_valid = date($date_format, $time) == $input; print "Valid? ".($is_valid ? 'yes' : 'no'); ?>

[#12] venadder at yahoo dot ca [2009-01-21 22:49:12]

Here is a simple IsDate function, using purely PHP functions( A Check for $Stamp can be added to see if it's a legal Unix timestamp ):

<?php function IsDate( $Str ) { $Stamp = strtotime( $Str ); $Month = date( 'm', $Stamp ); $Day = date( 'd', $Stamp ); $Year = date( 'Y', $Stamp ); return checkdate( $Month, $Day, $Year ); } ?>

[#13] a34 at yahoo dot com [2007-07-09 05:21:57]

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; } ?>