Convert times into interval array - php

Question

If I have the following variables:
$starttime = '09:00'; // Start time
$endtime = '21:00'; // End time
$interval = '30'; // In minutes
What would be the best way to generate the following array?
[
"09:00" => "09:30",
"09:30" => "10:00",
"10:00" => "10:30",
"10:30" => "11:00",
...
"20:00" => "20:30",
"20:30" => "21:00"
]
There are some similar topics that show how to array time intervals but none of them have been able to show my specific issue.

Answer 1

Using DateTime class with DateInterval you can achieve what you need.
DateTime - https://www.php.net/manual/pt_BR/class.datetime.php
DateInterval - https://www.php.net/manual/pt_BR/class.dateinterval.php
<?php
$startTime = DateTime::createFromFormat("H:i", "09:00");
$endTime = DateTime::createFromFormat("H:i", "22:00");
$interval = DateInterval::createFromDateString("30 minutes");
$result = [];
while ($startTime <= $endTime) {
$result[$startTime->format('H:i')] = $startTime->add($interval)->format('H:i');
}
echo print_r($result, true);

Answer 2

You can add 30 min to by this command :
$time=date("H:i", strtotime('+30 minutes', $time));
For your problem can set a while loop(for check condition).
Then set and array and set index to :
date("H:i", strtotime('+'.$interval.' minutes', $time));`
And set value to :
date("H:i", strtotime('+'.(2*$interval).'minutes', $time));
Then update $time.

Answer 3

You should just be able to use a 'while' loop to increment a timestamp until $endtime is reached. Here's a working example:
$starttime = '09:00'; // Start time
$endtime = '21:00'; // End time
$interval = '30'; // In minutes
$result = [];
$last = strtotime($starttime);
$endtimestamp = strtotime($endtime);
while ($last < $endtimestamp) {
$next = strtotime("+{$interval} minutes", $last);
$result[date('H:i', $last)] = date('H:i', $next);
$last = $next;
}
var_dump($result);

Answer 4

Can be done using DateTime and DateInterval
<?php
date_default_timezone_set('UTC');
// define start/end
$begin = DateTime::createFromFormat('H:i', '09:00');
$end = DateTime::createFromFormat('H:i', '21:00');
// define the interval
$interval = new DateInterval('PT30M');
$interval->invert = 1;
// get date range
$daterange = new DatePeriod($begin, $interval, $end);
// loop and build your array
$range = [];
foreach ($daterange as $date){
$range[$date->format("H:i")] = $date->sub($interval)->format("H:i");
}
print_r($range);
Result:
Array
(
[09:00] => 09:30
[09:30] => 10:00
[10:00] => 10:30
[10:30] => 11:00
[11:00] => 11:30
[11:30] => 12:00
[12:00] => 12:30
[12:30] => 13:00
[13:00] => 13:30
[13:30] => 14:00
[14:00] => 14:30
[14:30] => 15:00
[15:00] => 15:30
[15:30] => 16:00
[16:00] => 16:30
[16:30] => 17:00
[17:00] => 17:30
[17:30] => 18:00
[18:00] => 18:30
[18:30] => 19:00
[19:00] => 19:30
[19:30] => 20:00
[20:00] => 20:30
[20:30] => 21:00
)
https://3v4l.org/FqViY