PHP date function error

Question

I need to get year 30+ years in the future, which is why I am using below code.

$currentDate = date("Y-m-d"); 
$dateOneYearAdded = strtotime(date("Y-m-d", strtotime($currentDate)) . " +30 year");
$endYr = date('Y', $dateOneYearAdded);

But as I tested this code its working for 26 years only. I can add only 26 year into the current year. If I try to add more than 26 then it will revert to the year 1970.

Below code is working fine:

$currentDate = date("Y-m-d"); 
$dateOneYearAdded = strtotime(date("Y-m-d", strtotime($currentDate)) . " +26 year");
$endYr = date('Y', $dateOneYearAdded);

Is there something wrong with my code or is it an error in the PHP function?

You need to use the datetime object if you want to go past the 2030s — JohnP
– JohnP, Commented Jun 20, 2011 at 6:32

deceze · Accepted Answer · 2011-06-20 06:33:19Z

5

Congratulations, you have encountered the Y2K38 problem. You will either need to switch to a 64bit system, or use the DateTime class, which can represent (virtually) arbitrary dates.

answered Jun 20, 2011 at 6:33

deceze♦

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Community · Accepted Answer · 2023-11-17 20:42:18Z

3

See this article for information.

The UNIX timestamp counts the number of seconds since 1970, and as a 32-bit integer it has a maximum range of 2038.

You should use a DateTime object instead.

And of course, if you are storing dates in a database, be sure to use a DATE or DATETIME field.

edited Nov 17, 2023 at 20:42

CommunityBot

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answered Jun 20, 2011 at 6:32

Matthew

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John Carter · Accepted Answer · 2011-06-20 06:32:33Z

1

It's the timestamp you're asking for is greater than the maximum integer value that PHP can hold on your system.

answered Jun 20, 2011 at 6:32

John Carter

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Shakti Singh · Accepted Answer · 2011-06-20 06:33:04Z

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This is so because

The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer). However, before PHP 5.1.0 this range was limited from 01-01-1970 to 19-01-2038 on some systems (e.g. Windows).

you can use DateTime class instead

answered Jun 20, 2011 at 6:33

Shakti Singh

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Herr · Accepted Answer · 2011-06-20 06:51:27Z

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According to the PHP - date() function changelog,

The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer). However, before PHP 5.1.0 this range was limited from 01-01-1970 to 19-01-2038 on some systems (e.g. Windows).

So be sure to check the DateTime Class

edited Jun 20, 2011 at 6:51

answered Jun 20, 2011 at 6:32

Herr

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1 Comment

John Carter Over a year ago

Upgrading PHP won't help if you're still on a 32 bit system - DateTime is the right solution.

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