php dateTime::createFromFormat in 5.2?

I have been developing on php 5.3.

However our production server is 5.2.6.

I have been using

$开发者_C百科schedule = '31/03/2011 01:22 pm'; // example input
if (empty($schedule))
    $schedule = date('Y-m-d H:i:s');
else {
    $schedule = dateTime::createFromFormat('d/m/Y h:i a', $schedule);
    $schedule = $schedule->format('Y-m-d H:i:s');
}
echo $schedule;

However that function is not available in 5.2

What is the easiest way to get around this (no chance of a php upgrade).

just include the next code

function DEFINE_date_create_from_format()
  {

function date_create_from_format( $dformat, $dvalue )
  {

    $schedule = $dvalue;
    $schedule_format = str_replace(array('Y','m','d', 'H', 'i','a'),array('%Y','%m','%d', '%I', '%M', '%p' ) ,$dformat);
    // %Y, %m and %d correspond to date()'s Y m and d.
    // %I corresponds to H, %M to i and %p to a
    $ugly = strptime($schedule, $schedule_format);
    $ymd = sprintf(
        // This is a format string that takes six total decimal
        // arguments, then left-pads them with zeros to either
        // 4 or 2 characters, as needed
        '%04d-%02d-%02d %02d:%02d:%02d',
        $ugly['tm_year'] + 1900,  // This will be "111", so we need to add 1900.
        $ugly['tm_mon'] + 1,      // This will be the month minus one, so we add one.
        $ugly['tm_mday'], 
        $ugly['tm_hour'], 
        $ugly['tm_min'], 
        $ugly['tm_sec']
    );
    $new_schedule = new DateTime($ymd);

   return $new_schedule;
  }
}

if( !function_exists("date_create_from_format") )
 DEFINE_date_create_from_format();

Because strtotime does poorly when confronted with D/M/Y and date_create_from_format isn't available, strptime may be your only hope here. It does some pretty oldschool things, like deal with years as if they are the number of years since 1900 and deal with months as if January was month zero. Here's some horrible example code that uses sprintf to reassemble the date into something DateTime understands:

$schedule = '31/03/2011 01:22 pm';
// %Y, %m and %d correspond to date()'s Y m and d.
// %I corresponds to H, %M to i and %p to a
$ugly = strptime($schedule, '%d/%m/%Y %I:%M %p');
$ymd = sprintf(
    // This is a format string that takes six total decimal
    // arguments, then left-pads them with zeros to either
    // 4 or 2 characters, as needed
    '%04d-%02d-%02d %02d:%02d:%02d',
    $ugly['tm_year'] + 1900,  // This will be "111", so we need to add 1900.
    $ugly['tm_mon'] + 1,      // This will be the month minus one, so we add one.
    $ugly['tm_mday'], 
    $ugly['tm_hour'], 
    $ugly['tm_min'], 
    $ugly['tm_sec']
);
echo $ymd;
$new_schedule = new DateTime($ymd);
echo $new_schedule->format('Y-m-d H:i:s');

If it works, you should see the same, correct date and time printed twice.

I think it is much cleaner to extend the DateTime class and implement createFromFormat() yourself like this:-

class MyDateTime extends DateTime
{
    public static function createFromFormat($format, $time, $timezone = null)
    {
        if(!$timezone) $timezone = new DateTimeZone(date_default_timezone_get());
        $version = explode('.', phpversion());
        if(((int)$version[0] >= 5 && (int)$version[1] >= 2 && (int)$version[2] > 17)){
            return parent::createFromFormat($format, $time, $timezone);
        }
        return new DateTime(date($format, strtotime($time)), $timezone);
    }
}

$dateTime = MyDateTime::createFromFormat('Y-m-d', '2013-6-13');
var_dump($dateTime);
var_dump($dateTime->format('Y-m-d'));

This will work in all versions of PHP >= 5.2.0.

See here for a demo http://3v4l.org/djucq

Since this is not really showing how to convert YYYY:DDD:HH:MM:SS time to unix seconds using the "z" option you have to create you own functions to convert the DOY to month and day of month. This is what I did:

function _IsLeapYear ($Year)
{
    $LeapYear = 0;
    # Leap years are divisible by 4, but not by 100, unless by 400
    if ( ( $Year % 4 == 0 ) || ( $Year % 100 == 0 ) || ( $Year % 400 == 0 ) ) {
        $LeapYear = 1;
    }
    return $LeapYear;
}

function _DaysInMonth ($Year, $Month)
{

    $DaysInMonth = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

    return ((_IsLeapYear($Year) && $Month == 2) ? 29 : $DaysInMonth[$Month - 1]);
}

function yydddhhssmmToTime($Year, $DOY, $Hour, $Min, $Sec)
{
   $Day = $DOY;
   for ($Month = 1;  $Day > _DaysInMonth($Year, $Month);  $Month++) {
    $Day -= _DaysInMonth($Year, $Month);
   }

   $DayOfMonth = $Day;

   return mktime($Hour, $Min, $Sec, $Month, $DayOfMonth, $Year);
}

$timeSec = yydddhhssmmToTime(2016, 365, 23, 23, 23);
$str = date("m/d/Y H:i:s", $timeSec);
echo "unix seconds: " . $timeis . " " . $str ."<br>";

The output on the page shows its working since I can convert back the seconds back to the original input values. unix seconds: 1483140203 12/30/2016 23:23:23

$your_datetime_object=new DateTime($date);
$date_format_modified=date_format($your_datetime_object,'D M d Y');//Change the format of date time

I had the similar problem with the production server at 5.2, so I used the above datetime to create an object and then change the format to my liking as above.

Date and Time only

$dateTime = DateTime::createFromFormat('Y-m-d\TH:i:s', '2015-04-20T18:56:42');

ISO8601 no colons

$dateTime = DateTime::createFromFormat('Y-m-d\TH:i:sO', '2015-04-20T18:56:42+0000');

ISO8601 with colons

$date = $dateTime->format('c');

Salesforce ISO8601 format

DateTime::createFromFormat('Y-m-d\TH:i:s.uO', '2015-04-20T18:56:42.000+0000');

Hope this saves someone time!