Date/Time 函数
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date_add

(PHP 5 >= 5.3.0)

date_add — 别名 DateTime::add()

说明

此函数是该函数的别名： DateTime::add()

Date/Time 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 别名 DateTime::add

用户评论:

knyrii at gmail dot com (12-Jul-2011 05:45)

A function I use for fixing date ranges. Can also be used to create a new date by subtracting or adding days, months, or years. The resulting date will always be a valid date.
<?php
/**
 * Fixes the date so that it is valid. Can handle negative values. Great for creating date ranges.
 * NOTE: Changes the passed variables' values.
 * Ex. 2-29-2001 will become 3-1-2001
 * 15-6-2011 will become 3-6-2012
 * 3-0-2001 will become 2-28-2001
 * -10-29-2002 will become 3-1-2001
 * @param integer $month 0 values decrement a year and is set to 12.
 * @param integer $day 0 values decrement a month and is set to the last day of that month.
 * @param integer $year
 * @param boolean $unix Optional. Default is true. Use UNIX date format
 * @return string The resulting string
 */
function date_fix_date(&$month,&$day,&$year,$unix=true){
    if($month>12){
        while ($month>12){
            $month-=12;//subtract a $year
            $year++;//add a $year
        }
    } else if ($month<1){
        while ($month<1){
            $month +=12;//add a $year
            $year--;//subtract a $year
        }
    }
    if ($day>31){
        while ($day>31){
            if ($month==2){
                if (is_leap_year($year)){//subtract a $month
                    $day-=29;
                } else{
                    $day-=28;
                }
                $month++;//add a $month
            } else if (date_hasThirtyOneDays($month)){
                $day-=31;
                $month++;
            } else{
                $day-=30;
                $month++;
            }
        }//end while
        while ($month>12){ //recheck $months
            $month-=12;//subtract a $year
            $year++;//add a $year
        }
    } else if ($day<1){
        while ($day<1){
            $month--;//subtract a $month
            if ($month==2){
                if (is_leap_year($year)){//add a $month
                    $day+=29;
                }else{
                    $day+=28;
                }
            } else if (date_hasThirtyOneDays($month)){
                $day+=31;
            } else{
                $day+=30;
            }
        }//end while
        while ($month<1){//recheck $months
            $month+=12;//add a $year
            $year--;//subtract a $year
        }
    } else if ($month==2){
        if (is_leap_year($year)&&$day>29){
            $day-=29;
            $month++;
        } else if($day>28){
            $day-=28;
            $month++;
        }
    } else if (!date_hasThirtyOneDays($month)&&$day>30){
        $day-=30;
        $month++;
    }
    if ($year<1900) $year=1900;
    if ($unix){
        return "$year-$month-$day";
    } else{
        return "$month-$day-$year";
    }
}
/**
 * Checks to see if the month has 31 days.
 * @param integer $month
 * @return boolean True if the month has 31 days
 */
function date_hasThirtyOneDays($month){
    //1234567 89012:1357 802
    //JfMaMjJ AsOnD:JMMJ AOD
    if ($month<8)
        return $month%2==1;
    else
        return $month%2==0;
}
/**
 * Checks to see if the year is a leap year.
 * @param integer $year
 * @return boolean True if the year is a leap year
 */
function is_leap_year($year){
    return (0 ==$year%4&&0!=$year%100 || 0 ==$year%400);
}
?>

lanlife4real (10-Jan-2010 11:19)

This function allows the addition of day(s),month(s),year(s) to the original date while still preserving the Hours, minutes and seconds
You can also modify to add to hours, miuntes and even seconds.
 
<?php
function add_date($givendate,$day=0,$mth=0,$yr=0) {
      $cd = strtotime($givendate);
      $newdate = date('Y-m-d h:i:s', mktime(date('h',$cd),
    date('i',$cd), date('s',$cd), date('m',$cd)+$mth,
    date('d',$cd)+$day, date('Y',$cd)+$yr));
      return $newdate;
              }

?>

Hyun Woo Shin (27-Mar-2009 07:32)

Just add month(s) on the orginal date.

<?php
function add_date($orgDate,$mth){
  $cd = strtotime($orgDate);
  $retDAY = date('Y-m-d', mktime(0,0,0,date('m',$cd)+$mth,date('d',$cd),date('Y',$cd)));
  return $retDAY;
}
?>

raph (09-Sep-2008 10:37)

A little function to add 2 time lenghts. Enjoy !

<?php
function AddPlayTime ($oldPlayTime, $PlayTimeToAdd) {

    $pieces = split(':', $oldPlayTime);
    $hours=$pieces[0];
    $hours=str_replace("00","12",$hours);
    $minutes=$pieces[1];
    $seconds=$pieces[2];
    $oldPlayTime=$hours.":".$minutes.":".$seconds;

    $pieces = split(':', $PlayTimeToAdd);
    $hours=$pieces[0];
    $hours=str_replace("00","12",$hours);
    $minutes=$pieces[1];
    $seconds=$pieces[2];
   
    $str = $str.$minutes." minute ".$seconds." second" ;
    $str = "01/01/2000 ".$oldPlayTime." am + ".$hours." hour ".$minutes." minute ".$seconds." second" ;
   
    // Avant PHP 5.1.0, vous devez comparer avec  -1, au lieu de false
    if (($timestamp = strtotime($str)) === false) {
        return false;
    } else {
        $sum=date('h:i:s', $timestamp);
        $pieces = split(':', $sum);
        $hours=$pieces[0];
        $hours=str_replace("12","00",$hours);
        $minutes=$pieces[1];
        $seconds=$pieces[2];
        $sum=$hours.":".$minutes.":".$seconds;
       
        return $sum;
       
    }
}

$firstTime="00:03:12";
$secondTime="02:04:34";

$sum=AddPlayTime($firstTime,$secondTime);
if ($sum!=false) {
    echo $firstTime." + ".$secondTime." === ".$sum;
}
else {
    echo "failed";
}
?>