CI4 validation greater_than on date field

PHP Code:

// PHP Method to compare dates

// Declare two dates in different
// format and use DateTime() function
// to convert date into DateTime
$date1 = new DateTime("12-11-24");
$date2 = new DateTime("2011-03-26");


// Compare the two dates
if ( ! function_exists('compareDates'))
{
    function compareDates(string $date1, string date2): string
    {
        if ($date1 > $date2) {
            return $date1->format("Y-m-d") . " is greater than " . $date2->format("Y-m-d");
        } else {
            return $date1->format("Y-m-d") . " is less than " . $date2->format("Y-m-d");
        }
    }
} 


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