ระยะวันที่ DateDiff ระยะวันที่เวลา DateTimeDiff ระยะเวลา TimeDiff

<?php

function DateDiff($strDate1,$strDate2)

{

return (strtotime($strDate2) - strtotime($strDate1))/  ( 60 * 60 * 24 );  // 1 day = 60*60*24

}

function TimeDiff($strTime1,$strTime2)

{

return (strtotime($strTime2) - strtotime($strTime1))/  ( 60 * 60 ); // 1 Hour =  60*60

}

function DateTimeDiff($strDateTime1,$strDateTime2)

{

return (strtotime($strDateTime2) - strtotime($strDateTime1))/  ( 60 * 60 ); // 1 Hour =  60*60

}

echo "Date Diff = ".DateDiff("2008-08-01","2008-08-31")."<br>";

echo "Time Diff = ".TimeDiff("00:00","19:00")."<br>";

echo "Date Time Diff = ".DateTimeDiff("2008-08-01 00:00","2008-08-01 19:00")."<br>";

?>