如何将带有日期和时间AM / PM的字符串转换为24小时的mysql时间戳格式

Question

I am trying to insert date and time into mysql datetime field from a string having following dd/mm/yyyy hh:mm:ss AM/PM format:

20/10/2014 05:39 PM

20/10/2014 05:39 AM

I know MYSQL timestamp format is yyyy-mm-dd hh:mm:ss or 0000-00-00:00:00:00

So if I do:

$s = substr("20/10/2014 05:39 PM", 0, 10);
$h = date("G:i", strtotime($s));
list($day, $month, $year, $hour, $minute) = split('[/ :]', "20/10/2014 05:39 PM"); 
echo $d1me = $year . '-' . $month. '-' .  $day . ' ' . $h;

I get 2014-10-20 19:00

So I guess there is a problem with date_default_timezone_set() function, How to solve this and get expected result?

20/10/2014 05:39 PM     ->   2014-10-20 17:39:00

20/10/2014 05:39 AM     ->   2014-10-20 05:39:00

How to do it?

Answer 1

MySQL already knows how to parse many different types of date strings natively, using the STR_TO_DATE() function in combination with format strings used by DATE_FORMAT() .

So, I would not involve PHP in this process at all, and instead allow MySQL to parse the input itself.

The format string you need to use is %d/%m/%Y %h:%i %p , where the %p represents AM/PM .

You can use the entire expression right in your INSERT statement, passing the strings directly from PHP assuming you have validated their format already.

INSERT INTO your_table (timestamp_column) VALUES (STR_TO_DATE('20/10/2014 05:39 PM', '%d/%m/%Y %h:%i %p'));

...will correctly insert the DATETIME value 2014-10-20 17:39:00 into your table.

If you really prefer to do it in PHP first, use DateTime::createFromFormat() (PHP 5.3+) using the format string 'd/m/YH:i A'

$d = DateTime::createFromFormat('d/m/Y H:i A', '20/10/2014 05:39 PM');
var_dump($d);

class DateTime#2 (3) {
  public $date =>
  string(26) "2014-10-20 17:39:00.000000"
  public $timezone_type =>
  int(3)
  public $timezone =>
  string(15) "America/Chicago"

To get a MySQL formatted date back out of it,

echo $d->format('Y-m-d H:i:s');
// 2014-10-20 17:39:00

If you are in the deeply unfortunate situation of having a PHP version older than 5.3, you can achieve similar results with strptime() but you'll need to assemble its array output into MySQL's string format.

Answer 2

This should work for you:

<?php

    $input = "20/10/2014 05:39 AM";  //20/10/2014 05:39 PM

    list($day, $month, $year, $hour, $minute, $dayType) = preg_split('/[\/\s:]+/', $input); 
    echo $d1me = $year . '-' . $month. '-' .  $day . ' ' . ($dayType == "PM"?$hour+12: $hour) . ":" . $minute . ":00";

?>

Output:

2014-10-20 05:39:00  //2014-10-20 17:39:00

Answer 3

I think you can use the following code. It's easier to understand:

echo date("Y-m-d H:i", strtotime("20/10/2014 05:39 PM"));

Answer 4

如果你使用PHP，这是更好的方法

echo date('Y-m-d H:i', strtotime('20/10/2014 05:39 PM'));

Answer 5

echo date("Ymd H:i:s", strtotime("20-10-2014 05:39 PM"));

Use above code - but keep in mind you have "-" in place of "/" in input date.