Why Does Adding a Day to a Date Not Roll Over to the Next Month?

Correcting Date Addition with Month Rollover

Your code intends to add one day to a date, but it seems to return a date that precedes the addition. Let's delve into the issue and provide a solution that correctly rolls over months upon day addition.

The problematic code:

$stop_date = date('Y-m-d H:i:s', strtotime("2009-09-30 20:24:00"));
echo 'date before day adding: '.$stop_date; 
$stop_date = date('Y-m-d H:i:s', strtotime('+1 day', $stop_date));
echo ' date after adding one day. SHOULD be rolled over to the next month: '.$stop_date;

The error lies in the line where you perform the addition:

$stop_date = date('Y-m-d H:i:s', strtotime('+1 day', $stop_date));

This line uses the strtotime() function to manipulate the date. However, when you specify a time offset like ' 1 day', it does not roll over months correctly.

Solution

To correctly add a day and roll over months when necessary, you can use one of the following approaches:

PHP 5.3 :

$stop_date = '2009-09-30 20:24:00';
echo 'date before day adding: ' . $stop_date; 
$stop_date = date('Y-m-d H:i:s', strtotime($stop_date . ' +1 day'));
echo 'date after adding 1 day: ' . $stop_date;

PHP 5.2 :

$stop_date = new DateTime('2009-09-30 20:24:00');
echo 'date before day adding: ' . $stop_date->format('Y-m-d H:i:s'); 
$stop_date->modify('+1 day');
echo 'date after adding 1 day: ' . $stop_date->format('Y-m-d H:i:s');

These solutions will correctly add one day to the specified date and roll over months as needed.

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