move to next year when 12 months are added to first payment date

Author: Mayisha

includes/class-wc-subscriptions-synchroniser.php

@@ -687,7 +687,7 @@ public static function calculate_first_payment_date( $product, $type = 'mysql',
 				}
 			}
 			// when a certain number of months are added and the first payment date moves to next year
-			if ( $month_number < gmdate( 'm', $from_timestamp ) ) {
+			if ( $month_number <= gmdate( 'm', $from_timestamp ) ) {
 				$year       = gmdate( 'Y', $from_timestamp );
 				$year++;
 				$first_payment_timestamp = wcs_strtotime_dark_knight( "{$payment_day} {$month} {$year}", $from_timestamp );