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() - 将任何字符串的日期时间描述解析为 Unix 时间戳

User Contributed Notes

Daniel 24-Mar-2017 02:51


@whitej71 



In the example you gave, it is correctly returning false. The function example is comparing a string to a known date format. I suggest reading the documentation on the date format to see why you're making the wrong assumption.

whitej71 at msu dot edu 15-Jul-2016 02:10


The below suggested date validation (from another note) does NOT work for ALL formats and date inputs.



function validateDate($date, $format = 'Y-m-d H:i:s')

{

    $d = DateTime::createFromFormat($format, $date);

    return $d && $d->format($format) == $date;

}



A couple of examples should suffice as a warning to test carefully and particularly not to use code that allows passing in of just any date format string:



var_dump(validateDate('7/01/16', 'n/j/y')); # false but should be true

var_dump(validateDate('7/1/16', 'm/d/y')); # false but should be true



Sorry, I don't have a suggested correction.

glavic at gmail dot com 12-Sep-2013 09:46


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

# ...