How to calculate the difference between two datetimes using PHP.

php - Modify DateTime object - Stack Overflow.
php - What causes "undefined function" date_diff? - Stack Overflow.
I keep getting an error trying to implement DATE_DIFF in mySQL. I'm trying to get the .. Convert DATE to DATETIME in php and mySQL.

PHP: DateTime::add - Manual.

php datetime diff error

time - $date = new DateTime for older PHP versions - Stack Overflow.

datediff - PHP Difference in months between two dates? - Stack.

PHP: replacement for DateTime object - Stack Overflow.

DateTime::add. date_add. (PHP 5 >= 5.3.0). DateTime::add -- date_add â Adds an amount of days, months, years, hours, minutes and seconds to a DateTime.
//PHP5.3: $days = $from->diff($to)->days + 1; $timestamp_from = (int) $from-> format('U'); $timestamp_to = (int) $to->format('U'); $days = (int).
Fatal error: Call to undefined function date_diff() in. The date_diff() function is part of PHP >= 5.3.. DateTime was introduced in PHP 5.2.
PHP: DateTime::__construct - Manual.
DateTime::add. date_add. (PHP 5 >= 5.3.0). DateTime::add -- date_add â Adds an amount of days, months, years, hours, minutes and seconds to a DateTime.
//PHP5.3: $days = $from->diff($to)->days + 1; $timestamp_from = (int) $from-> format('U'); $timestamp_to = (int) $to->format('U'); $days = (int).
Fatal error: Call to undefined function date_diff() in. The date_diff() function is part of PHP >= 5.3.. DateTime was introduced in PHP 5.2.
14 Jun 2012. Bug #62327, Calculation error in DateTime::add() or DateTime::diff(). The bug was found on Windows Server 2008/Apache 2.4.2/PHP 5.4.4.
php: DateTime::diff() on 5.2 · need help fixing my php script, suppose to give me the diff between 2 dates · Error to calculate date diff with.