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<?php function percentYear($a, $b) { //Takes in two dates and returns the decimal of days per year for that specific year // I made this in order to fix the issue of leap years. if(strtotime($a)<strtotime($b)){ list($a, $b) = array($b, $a); } $aYearDay = date("z", strtotime($a)) + 1; $aYearDays = date("z", strtotime(date("Y", strtotime($a))."-12-31")) + 1; $aPercent = $aYearDay/$aYearDays; $bYearDay = date("z", strtotime($b)) + 1; $bYearDays = date("z", strtotime(date("Y", strtotime($b))."-12-31")) + 1; $bPercent = $bYearDay/$bYearDays; if(date("Y", strtotime($a))!=date("Y", strtotime($b))) { $aPercent += abs(date("Y", strtotime($a))-date("Y", strtotime($b))); } return abs($aPercent-$bPercent); } var_dump( percentYear("2013-02-04", "2012-02-04"))*365; var_dump( percentYear("2011-02-04", "2010-02-04"));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
float(1.0002619956584) float(1)