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Bug #68503 date_diff on two dates with timezone set localised returns wrong results
Submitted: 2014-11-26 10:36 UTC Modified: 2021-04-06 19:52 UTC
Votes:2
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:1 (50.0%)
Same OS:1 (50.0%)
From: chris at vostron dot com Assigned: derick (profile)
Status: Closed Package: Date/time related
PHP Version: 5.6.3 OS: Ubuntu Trusty
Private report: No CVE-ID: None
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From: chris at vostron dot com
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 [2014-11-26 10:36 UTC] chris at vostron dot com
Description:
------------
When using date_diff in a localised time zone and the date_diff will traverse a daylight saving boundary, the number of days returned is 1 fewer than expected.

This is understandable given the missing hour.  However, it doesn't then set the "h" value to 23, which would be expected.  Other option is that if we're not going to compare hours/mins/seconds when only passed a date, it should return "m" of 3, "d" of 0 in the example script.

Test script:
---------------
date_default_timezone_set('Europe/London');
var_dump(date_diff(new DateTime("2015-02-01"), new DateTime("2015-05-01")));
date_default_timezone_set('UTC');
var_dump(date_diff(new DateTime("2015-02-01"), new DateTime("2015-05-01")));

Expected result:
----------------
object(DateInterval)#3 (15) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(3)
  ["d"]=>
  int(0)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  int(89)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}
object(DateInterval)#2 (15) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(3)
  ["d"]=>
  int(0)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  int(89)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}

-- OR --

object(DateInterval)#3 (15) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(2)
  ["d"]=>
  int(30)
  ["h"]=>
  int(23)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  int(89)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}
object(DateInterval)#2 (15) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(3)
  ["d"]=>
  int(0)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  int(89)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}

Actual result:
--------------
object(DateInterval)#3 (15) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(2)
  ["d"]=>
  int(30)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  int(89)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}
object(DateInterval)#2 (15) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(3)
  ["d"]=>
  int(0)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  int(89)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}


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 [2021-04-06 19:52 UTC] derick@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: derick
 [2021-04-06 19:52 UTC] derick@php.net
The fix for this bug has been committed.
If you are still experiencing this bug, try to check out latest source from https://github.com/php/php-src and re-test.
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Fixed for PHP 8.1.
 
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