checkdate
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 ==$year%400);
}
?>
Description
This function is an alias of: DateTime::add()
add a note
User Contributed Notes
date_add
knyrii at gmail dot com
12-Jul-2011 03:45
lanlife4real
09-Jan-2010 08:19
This function allows the addition of day(s),month(s),year(s) to the original date while still preserving the Hours, minutes and seconds
You can also modify to add to hours, miuntes and even seconds.
<?php
function add_date($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 $newdate;
}
?>
Hyun Woo Shin
27-Mar-2009 05:32
Just add month(s) on the orginal date.
<?php
function add_date($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 $retDAY;
}
?>
raph
09-Sep-2008 08:37
A little function to add 2 time lenghts. Enjoy !
<?php
function AddPlayTime ($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";
}
?>