How to divide datetime period into separate days in PHP - php

Question

I need to divide time period for example from:
2015-11-22 11:22:33 to 2015-11-24 02:02:04
into something like this:
2015-11-22 11:22:33 - 2015-11-22 23:59:59
2015-11-23 00:00:00 - 2015-11-23 23:59:59
2015-11-24 00:00:00 - 2015-11-24 02:02:04.
It has to work also for periods shorter than 24h, so for
2015-11-22 11:22:33 to 2015-11-23 02:02:04
I need this:
2015-11-22 11:22:33 - 2015-11-22 23:59:59
2015-11-23 00:00:00 - 2015-11-23 02:02:04.
I found almost perfect piece of code, but it only works for periods longer than 24h and I don't know how to tune it.
<?php
$start_date = '27:04:2013';
$start_time = '16:30';
$end_date = '29:04:2013';
$end_time = '22:30';
// Date input strings and generate a suitable DatePeriod
$start = DateTime::createFromFormat("d:m:Y H:i", "$start_date $start_time");
$end = DateTime::createFromFormat("d:m:Y H:i", "$end_date $end_time");
$interval = new DateInterval('P1D');
$period = new DatePeriod($start, $interval, $end);
foreach ($period as $date) {
// Get midnight at start of current day
$date_start = clone $date;
$date_start->modify('midnight');
// Get 23:59:59, end of current day
// (moving to midnight of next day might be good too)
$date_end = clone $date;
$date_end->modify('23:59:59');
// Take care of partial days
$date_start = max($start, $date_start);
$date_end = min($end, $date_end);
// Here you would construct your array of
// DateTime pairs, or DateIntervals, as you want.
printf(
"%s -> %s \n",
$date_start->format('Y-m-d H:i'),
$date_end->format('Y-m-d H:i')
);
}
?>

Answer 1

Try this:
$date1 = '2015-11-22 11:22:33';
$date2 = '2015-11-23 12:22:34';
$f1 = strtotime($date1);
$f2 = strtotime(substr($date1, 0, 10) . " 23:59:59");
while($f2 < strtotime($date2)) {
print(date('Y-m-d H:i:s',$f1) .' - ' .date('Y-m-d H:i:s',$f2).'<br>');
$f1 = strtotime(date('Y-m-d H:i:s', $f2) .' +1 second');
$f2 = strtotime(date('Y-m-d H:i:s', $f2) .' +1 day');
}
print(date('Y-m-d H:i:s',$f1) .' - ' .$date2.'<br>');

Answer 2

See here: http://sandbox.onlinephpfunctions.com/code/77eaae15fdd7c0d2ca1f02a2d225c17199218819
$datetime1 = new DateTime('2015-11-22 11:22:33');
$datetime2 = new DateTime('2015-11-23 02:02:04');
$interval = $datetime1->diff($datetime2);
var_dump($interval->format('%y-%m-%d %h:%i:%s'));
// RESULT: string(14) "0-0-0 14:39:31"
References:
http://php.net/manual/de/datetime.diff.php
http://php.net/manual/de/class.dateinterval.php
http://php.net/manual/de/dateinterval.format.php