PHP add up two time variables

Question

In my PHP application I want to calculate the sum of two time variables. I am looking for something like this example.

$time1 = 15:20:00;
$time2 = 00:30:00;
$time = $time1+$time2;

Do you have some examples of what your results should look like? — Pete
– Pete, Commented Jul 30, 2012 at 11:46
DateTime and DateInterval classes. php.net/manual/en/book.datetime.php — dnagirl
– dnagirl, Commented Jul 30, 2012 at 11:47
The result should added current time + a time variable which i am taking from DB say $tim2 — Rakesh
– Rakesh, Commented Jul 30, 2012 at 11:50
date and times cant be added directly, checkout Sammaye answer, you have to convert them to strings first and then add. — Altaf Hussain
– Altaf Hussain, Commented Sep 12, 2013 at 12:10

luissquall · Accepted Answer · 2015-08-27 18:00:45Z

9

If the answer you expect is 15:50:00 and you want to use strtotime and date functions, you need to subtract the seconds $time1 and $time2 share when you transform them to unix timestamps:

$time1 = '15:20:00';
$time2 = '00:30:00';
$time = strtotime($time1) + strtotime($time2) - strtotime('00:00:00');
$time = date('H:i:s', $time);

answered Aug 27, 2015 at 18:00

luissquall

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1 Comment

rhavendc Over a year ago

This is great and simple but it would be more relevant if you can provide further explanations about subtracting that 0 value time.

Sammaye · Accepted Answer · 2012-07-30 11:46:42Z

5

The best way to do this is most likely to use strtotime to convert them to timestamps and then do the adding together:

$o = strtotime($time1)+strtotime($time2);

If I remember right strtotime does support this format.

Otherwise you will need to filter it out yourself.

answered Jul 30, 2012 at 11:46

Sammaye

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7 Comments

Rakesh Over a year ago

The result should added current time + a time variable which i am taking from DB say $tim2

Rakesh Over a year ago

$time = date("H:i:s")+strtotime($mysql_time); you mean this way..?

Sammaye Over a year ago

@Rakesh No, time() returns a timestamp of the current time so you wanna use time()

Sammaye Over a year ago

@Rakesh Wait what do you mean? What part of the current time do you wanna add? the hour:sec:minute? try: strtotime(date('H:i:s'))+strtotime($mysql_time)

Sammaye Over a year ago

@Rakesh Your looking for interval not to add the two together. Look at feela's answer below.

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cha · Accepted Answer · 2016-06-03 08:05:14Z

4

Following answer does not return correct value. It is summing integers but not returned correct time.

$o = strtotime($time1)+strtotime($time2);

I created a function to get calculated time as follows.

public function addTwoTimes($time1 = "00:00:00", $time2 = "00:00:00"){
        $time2_arr = [];
        $time1 = $time1;
        $time2_arr = explode(":", $time2);
        //Hour
        if(isset($time2_arr[0]) && $time2_arr[0] != ""){
            $time1 = $time1." +".$time2_arr[0]." hours";
            $time1 = date("H:i:s", strtotime($time1));
        }
        //Minutes
        if(isset($time2_arr[1]) && $time2_arr[1] != ""){
            $time1 = $time1." +".$time2_arr[1]." minutes";
            $time1 = date("H:i:s", strtotime($time1));
        }
        //Seconds
        if(isset($time2_arr[2]) && $time2_arr[2] != ""){
            $time1 = $time1." +".$time2_arr[2]." seconds";
            $time1 = date("H:i:s", strtotime($time1));
        }

        return date("H:i:s", strtotime($time1));
    }

answered Jun 3, 2016 at 8:05

cha

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2 Comments

Sammaye Over a year ago

Yeah your scenario was a bit more complex and required more use of strototime

cha Over a year ago

Yes. That's true. We can use this kind of solution until find a better approach to solve that

Community · Accepted Answer · 2017-05-23 10:30:45Z

2

You could use the PHP 5.3 DateInterval:

$timeInterval = DateInterval::createFromDateString( '15 hours + 20 minutes' );
$timeInterval2 = DateInterval::createFromDateString( '30 minutes' );

foreach( str_split( 'ymdhis' ) as $prop )
{
    $timeInterval->$prop += $timeInterval2->$prop;
}
var_dump( $timeInterval->format( '%H:%i:%s' ) );

(How to add to DateInterval objects was explained here: How we can add two date intervals in PHP)

edited May 23, 2017 at 10:30

CommunityBot

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answered Jul 30, 2012 at 11:58

feeela

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Comments

Patrick G · Accepted Answer · 2013-09-12 12:34:21Z

0

As far as I can tell, Sammaye's answer did't work out for me.

I needed to start the time I wanted to add with the start of the UNIX timestamp. This way, strtotime returns the seconds that need to be added to the first time.

$time1 = "15:20:00";
$time2 = "1970-01-01 00:30:00";
$time = strtotime($time1) + (strtotime($time2) + 3600);
echo $time . "<br />";
echo date("H:i:s", $time);

edited Sep 12, 2013 at 12:34

answered Sep 12, 2013 at 12:09

Patrick G

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Comments

Community · Accepted Answer · 2023-11-17 20:33:26Z

0

Be sure to consult the mystic docs https://www.php.net/strtotime for additional things you can input into your functions :)

$today = time();
$tommorrow = strtotime("+1 days", $today);
$day_after_tomorrow = strtotime("+1 days", $tomorrow);

edited Nov 17, 2023 at 20:33

CommunityBot

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answered Feb 15, 2014 at 17:28

britter

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Comments

Sumesh TG · Accepted Answer · 2012-07-30 11:51:20Z

-1

Code:

$time1 = '15:20:00';
$time2 = '00:30:00';
$time = strtotime($time1)+strtotime($time2);
$sumtime = date("H:i:s",$time);

answered Jul 30, 2012 at 11:51

Sumesh TG

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2 Comments

Rakesh Over a year ago

Hi sumesh how to add current time + $time2 ..?

Yasin Yörük Over a year ago

This one should return 15:50:00 but returns 09:21:44

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