From 2f65a54adb00d01888019d7e1d67c0c33c18d950 Mon Sep 17 00:00:00 2001
From: Julien Rosset <julien.rosset@solulog.fr>
Date: Sun, 26 Feb 2023 13:50:20 +0100
Subject: [PATCH] Fix Grand Mother day's calculation

---
 php/PublicHolidayCalendar.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/php/PublicHolidayCalendar.php b/php/PublicHolidayCalendar.php
index e853f1a..c1adcfb 100644
--- a/php/PublicHolidayCalendar.php
+++ b/php/PublicHolidayCalendar.php
@@ -295,7 +295,7 @@ class PublicHolidayCalendar {
     private static function calculateGrandMotherDay (int $year): DateTimeImmutable {
         $grandMotherDay = static::createDate($year, 3, 1);
         try {
-            $grandMotherDay = $grandMotherDay->sub(new DateInterval('P' . (7 - (int)$grandMotherDay->format('N')) . 'D'));
+            $grandMotherDay = $grandMotherDay->add(new DateInterval('P' . (7 - (int)$grandMotherDay->format('N')) . 'D'));
         }
         catch (Exception) {
         }