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I discovered that a DateTime object in PHP can be compared to another as the ">" and "<" operators are overloaded. Is it the same with DateInterval? As I was trying to answer this question, I found something strange: <?php $today = new DateTime(); $release = new DateTime('14-02-2012'); $building_time = new DateInterval('P15D'); var_dump($today->diff($release)); var_dump($building_time); var_dump($today->diff($release)>$building_time); var_dump($today->diff($release)<$building_time); if($today->diff($release) < $building_time){ echo 'oK'; }else{ echo 'Just a test'; } It always echoes "Just a test". The var_dump outputs are: object(DateInterval)#4 (8) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(18) ["h"]=> int(16) ["i"]=> int(49) ["s"]=> int(19) ["invert"]=> int(1) ["days"]=> int(18) } object(DateInterval)#3 (8) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(15) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["invert"]=> int(0) ["days"]=> bool(false) } bool(false) bool(true) When I try with a DateTime as "01-03-2012" everything works.

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