PHP 7 create_function deprecated

If you’re using PHP7.x you may get an error of create_function deprecated

Somewhere around line 196 of datetimepicker.php

create_function('$var', 'return ! empty($var);') is the problem.
Change that line to
function($var) {return ! empty($var);}

So that section around line 194 reads:

private function options_encode() {
		$options = json_encode(array_filter(
			$this->options,
			function($var) {return ! empty($var);}
		));
		return stripslashes($options);
	}