Add one billion seconds to DateTime object in PHP

Question

I'm having a lot of trouble and no success in adding 1 billion seconds to a DateTime object (user input variable).

The user enters their date of birth (DOB) in format YYYY-m-d H:i:s. This is then converted to DateTime(). Then 1 billion seconds are added to the DOB. The output is to be the DOB + 1 billion seconds, in format YYYY-m-d H:i:s.

I can not work out how to do this, and haven't found any suitable examples from other posts which have solved this issue.

Any help is welcome. Thanks

What have you tried so far? There should be tons of examples out there to add a number of seconds to an existing `DateTime` instance — Nico Haase, Jan 25 '19 at 14:28

score 2 · Answer 1 · answered Jan 25 '19 at 14:41

2

You can use DateTime::add function http://php.net/manual/en/datetime.add.php

$date = new DateTime(DOB);
$date->add(new DateInterval('PT1000000000S'));
echo $date->format('Y-m-d H:i:s') . "\n";

answered Jan 25 '19 at 14:41

Jeremiah

40
3

An excellent example of DateInterval usage. – David J Eddy Jan 25 '19 at 14:41

score 0 · Answer 2 · answered Jan 25 '19 at 14:35

echo date("Y-m-d H:i:s", (strtotime('1991-12-13 06:25:12') + 1000000000));

You can do it in one line of code. Convert your date using strtotime and add the seconds. It's weird to ask for H:i:s in a dob field though.

The output is 2023-08-21 09:11:52 (double checked also through here)

score 0 · Answer 3 · answered Jan 25 '19 at 14:40

Man, I always hated doing datetime logic. In my experience the easiest way to do this is to convert everything to Unix timestamp. I integers are easier to manipulate than DateTime object (though this mentality could be a hold over from #backintheday).

Do your logic would be something similar to the following:

$dob = strtotime('2018-1-1 12:00:00');
echo $dob;
echo  "\n";
$sum = ($dob + 1000000000);
echo date('r', $sum);

That should get you heading the way you want.

*Note be sure your machine is 64 bit, else dates after 2039 won't work due to the limits of 32 bit integers.

Add one billion seconds to DateTime object in PHP

3 Answers3