increment date by one month

Question

Let's say I have a date in the following format: 2010-12-11 (year-mon-day)

With PHP, I want to increment the date by one month, and I want the year to be automatically incremented, if necessary (i.e. incrementing from December 2012 to January 2013).

Regards.

Answer 1

$time = strtotime("2010.12.11"); $final = date("Y-m-d", strtotime("+1 month", $time));  // Finally you will have the date you're looking for. 

Answer 2

I needed similar functionality, except for a monthly cycle (plus months, minus 1 day). After searching S.O. for a while, I was able to craft this plug-n-play solution:

function add_months($months, DateTime $dateObject)      {         $next = new DateTime($dateObject->format('Y-m-d'));         $next->modify('last day of +'.$months.' month');          if($dateObject->format('d') > $next->format('d')) {             return $dateObject->diff($next);         } else {             return new DateInterval('P'.$months.'M');         }     }  function endCycle($d1, $months)     {         $date = new DateTime($d1);          // call second function to add the months         $newDate = $date->add(add_months($months, $date));          // goes back 1 day from date, remove if you want same day of month         $newDate->sub(new DateInterval('P1D'));           //formats final date to Y-m-d form         $dateReturned = $newDate->format('Y-m-d');           return $dateReturned;     } 

Example:

$startDate = '2014-06-03'; // select date in Y-m-d format $nMonths = 1; // choose how many months you want to move ahead $final = endCycle($startDate, $nMonths); // output: 2014-07-02