How to I substract time in PHP along with AM/PM

Question

I have time format say:

$start_time; (example: 1:30 PM) $system_time; (example: 8:20 AM) echo $time_left_for_discussion = $start_time - $system_time;

I want to substract $start_time - $system_time. But its not showing the correct result.

How can I deal with this kind of time substraction?

Difference must be less than 24h? Should consider changing the summer and winter time? — sectus
– sectus, Commented Mar 28, 2013 at 8:32

Rijk · Accepted Answer · 2013-03-28 08:33:33Z

Use DateTime::createFromFormat() on both times, and substract those.

$TimeStart = DateTime::createFromFormat( 'g:i A', $start_time ); $TimeEnd = DateTime::createFromFormat( 'g:i A', $end_time ); $Interval = $TimeStart->diff( $TimeEnd ); $time_left = $Interval->h . 'h' . $Interval->m 'm';

alwaysLearn · Accepted Answer · 2013-03-28 09:21:00Z

2

<?php $d1 = strtotime('1:30 PM'); $d2 = strtotime('8:20 AM'); $diff = abs($d1-$d2); echo "Difference is $diff secs"; ?>

edited Mar 28, 2013 at 9:21

answered Mar 28, 2013 at 8:38

alwaysLearn

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9 Comments

J.K.A. Over a year ago

Its not showing the correct different if I am converting seconds into the hours using gmdate("h:i:s",abs($d1 - $d2))

alwaysLearn Over a year ago

@jks I am getting it as 5hours and 10 min ... which I think is correct.. ?

J.K.A. Over a year ago

it showing diff between 5:00 PM and 9:29 AM is 7.5166666666667

J.K.A. Over a year ago

I am considering am/pm also here for getting difference

alwaysLearn Over a year ago

its correct ,, I think difference is 7 hours and 30 min .. mean 7.5 hours .. whats the problem .... ?

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Gung Foo · Accepted Answer · 2013-03-28 08:32:57Z

you will want to look at the date() and strtotime() functions.

the way to deal with such a case is to convert the dates into unix timestamps, subtract one timestamp form another and then recreate a date string from the resulting timestamp.

Note: the time() function will return the current system time(-stamp)

LukeStoneHm · Accepted Answer · 2013-03-28 08:33:06Z

Can I recommend you take a look at this http://php.net/manual/en/function.strtotime.php

This is String to time, it is very useful.

Have a good day :D

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