How to Correctly Add a Day to a Date in PHP and Handle Month Rollover?

Trouble Adding a Day to Dates: Resolving Month Rollover Issues

The code provided attempts to increment a date by one day but fails to account for month roll overs. Here's a detailed explanation of the problem and potential solutions:

Understanding the Problem

PHP's strtotime() function doesn't handle month roll overs correctly. This becomes evident when adding a day to dates near the end of a month, as seen in the provided code:

$stop_date = date('Y-m-d H:i:s', strtotime("2009-09-30 20:24:00"));

The resulting $stop_date is rolled back to the previous month's last day instead of advancing to October 1st.

Solution 1: Using a String Concatenation Trick

To resolve this issue, manually append the " 1 day" expression to the original date string before calling strtotime():

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

This technique forces strtotime() to interpret the proper date range and correctly add one day to the date.

Solution 2: Utilizing DateTime Class (PHP 5.2.0 )

For PHP 5.2.0 , you can take advantage of the DateTime class:

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

The modify() method provides a convenient way to increment dates, automatically handling month roll overs.

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