PHP Regular validation Date time format Instance Code _php Tutorial

Using PHP to verify the date format we can use the checkdate () function and regular expressions to verify, and I will give you a brief introduction to my classmates in the validation date format some process, and finally the simplest way.

1. Use the regular validation date time format
Mainly use PHP functions such as Ereg, Preg_match and so on.
There's a very simple,

The code is as follows	Copy Code
$dateTime = "2010-6-4 00:00:00″; if (Preg_match ("/^d{4}-d{2}-d{2} d{2}:d {2}:d {2}$/s", $dateTime)) { echo "Yes"; }else{ echo "No"; }

But this is only verified by the number, not the boundary value verification, not comprehensive, so someone wrote this regular

The code is as follows

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Regex = "^ ((d{2} ([02468][048]) | ( [13579] [26])) [-/s]? (((0? [13578] )| (1[02])) [-/s]? ((0? [1-9]) | ([1-2][0-9]) | (3[01])) | ((0? [4 69]) | (11)) [-/s]? ((0? [1-9]) | ([1-2][0-9]) | (30))) | (0?2[-/ S]? ((0? [1-9]) | ([1-2][0-9])))) | (D{2} ([02468][1235679]) | ( [1 3579][01345789])) [-/s]? (((0? [13578]) | (1[02])) [-/s]? (( 0? [1-9]) | ([1-2][0-9]) | (3[01])) | ((0? [469]) | (11)) [-/s]? (( 0? [1-9]) | ([1-2][0-9]) | (30))) | (0?2[-/s]? ((0? [1-9]) | (1[0-9] )| (2[0-8]))))) “; Date part Regex + = "(S ((0?[ 0-9]) | ([1-2][0-3])):( [0-5]? [0-9]) ((s) | (:([0-5]? [0-9])))? $ "; Time section

This is simply the work of God.
So I had to give up using the regular to verify the legitimacy of the time format.

2. The time string is disassembled to verify the date-time format, respectively.
The main use of checkdate and other PHP functions.
This method is very good, the validation is accurate, but the code is difficult to write, you need to separate the date and time, the date using Checkdate ($k [1], $k [2], $k [0]) to verify that the time needs to be disassembled and checked.

In fact, can be combined with the above two methods to use, the operation is much more convenient.
1. The first use of the regular validation is the "2011-11-07 12:30:55" format.

Use

The code is as follows	Copy Code
Preg_match ("/^d{4}-d{2}-d{2} d{2}:d {2}:d {2}$/s", $dateTime)

You can do it.
2. Then use the Strtotime () function to determine the validation, passing in the date string.
The Strtotime () function returns the UNIX timestamp corresponding to the specified datetime string by default.
A feature of the Strtotime () function is that it is convenient to return FALSE if the incoming date string is malformed, and to support various date formats.

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