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<?php function yearlyDays($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)){ $temp = $a; $a = $b; $b = $temp; unset($temp); } $aYearDay = date("z", strtotime($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 $aPercent-$bPercent; } print yearlyDays("2013-05-12", "2012-05-12");
Output for 4.3.0 - 7.1.0
0.99825585747436