converting array values to time in php - php

Question

I have an array which contains time values in GMT. :
Array
(
[0] => Array
(
[h] => 5
[m] => 0
)
)
Here Array[0][0] is the array for start time and Array[0][1] is the array for end time.
Now what I am creating time using date time as:
$timezone = new DateTimeZone("Asia/Kolkata"); //Converting GMT to IST.
$startTime = new DateTime();
$startTime->setTime($Array[1][0]["hour"], $Array[1][0]["minute"]);
$startTime->setTimezone($timezone);
$startTime->format('h:i a'); //output 10:30 PM // Should be 10:30 AM
$endTime = new DateTime();
$endTime->setTime($Array[1][1]["hour"], $Array[1][1]["minute"]);
$endTime->setTimezone($timezone);
$endTime->format('h:i a'); //output 10:30 PM //ok
So My $startTime and $endTime both has the same value of `10:30` PM but I want the startTime to have value of `10:00 AM`because its period was `AM` in the array.

Answer 1

When creating new Datetime object You have to specify timezone, because default value is taken from PHP configuration and this may not be set to GMT. So initialization of $startTime and $endTime should be:
$startTime = new DateTime('', new DateTimeZone('GMT'));
$endTime = new DateTime('', new DateTimeZone('GMT'));
Then when You are using setTime() You have to add 12 hours when PM period is taken. It should look like that:
$startTime->setTime($Array[1][0]["hour"] + ($Array[1][0]["period"] === 'PM' ? 12 : 0), $Array[1][0]["minute"]);
$endTime->setTime($Array[1][1]["hour"] + ($Array[1][1]["period"] === 'PM' ? 12 : 0), $Array[1][0]["minute"]);
Rest of the code looks fine, besides in You example $Array[1] is undefined. $Array[0] is set.

Answer 2

You could also use DateTime::createFromFormat():
$d = DateTime::createFromFormat('g:m A', '5:30 PM', new DateTimeZone('GMT'));
$d->setTimeZone(new DateTimeZone('Asia/Kolkata'));
var_dump($d->format('Y-m-d H:i:s'));
Gives:
string(19) "2017-03-16 22:30:00"
You can create the string '5:30 PM' by combining the elements of your array. Please note that you must add a leading 0 to the minutes if they are less than 10, e.g: 9 minutes -> 09