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# checkdate

(PHP 3, PHP 4 , PHP 5)

checkdate -- Validate a Gregorian date

## Description

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

Returns `TRUE` if the date given is valid; otherwise returns `FALSE`. Checks the validity of the date formed by the arguments. A date is considered valid if:

- year is between 1 and 32767 inclusive

- month is between 1 and 12 inclusive

- Day is within the allowed number of days for the given month. Leap years are taken into consideration.

範例 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)

See also mktime() and strtotime().

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