[PHP-NOTES] note 130623 added to class.dateinterval

I typically ignore the comments section on php.net; however, I should note that it is wrong to even attempt comparison between date intervals by adding them to a zero date because PHP's date intervals are stored in ambiguous units of time (days, months, and years are not regular).

a correct date interval is stored in terms of seconds (plus integer microseconds, typically) between the two dates. any more coarse measurement for approximate purposes is then derived from the interval. 

just skip this entirely, and write your own interval type based on the above, from first principals. it's easy.
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Manual Page -- https://php.net/manual/en/class.dateinterval.php
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