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Bug #68078 Datetime comparisons ignore microseconds
Submitted: 2014-09-22 19:50 UTC Modified: 2016-01-29 14:33 UTC
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: stephen dot r dot burrows at gmail dot com Assigned: derick (profile)
Status: Closed Package: Date/time related
PHP Version: Irrelevant OS: OS X 10.9.4
Private report: No CVE-ID: None
 [2014-09-22 19:50 UTC] stephen dot r dot burrows at gmail dot com
Two datetimes with all values the same (except microseconds) always compare as "equal". To put it another way, if you're trying to find out which one came first, you can't.

Test script:
$dt1 = new DateTime("2014-09-19 17:16:35.694274 America/Los_Angeles");
$dt2 = new DateTime("2014-09-19 17:16:35.728291 America/Los_Angeles");
var_dump($dt1 < $dt2);
# bool(false)
var_dump($dt1 == $dt2);
# bool(true)

# Not setting timezone because already have same timezone.
var_dump($dt1->format("Y-m-d H:i:s.u") < $dt2->format("Y-m-d H:i:s.u"));
# bool(true)
var_dump($dt1->format("Y-m-d H:i:s.u") == $dt2->format("Y-m-d H:i:s.u"));
# bool(false)

Expected result:
The smaller datetime should compare as less than the larger one. To put this another way, the comparison of the objects should be the same whether you're comparing them as objects or as strings (and the string version is clearly correct IMO.)


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 [2016-01-29 14:33 UTC]
-Status: Open +Status: Closed -Assigned To: +Assigned To: derick
 [2016-01-29 14:33 UTC]
The fix for this bug has been committed.

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Thank you for the report, and for helping us make PHP better.

Thanks Willem-Jan!
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