From 02b6941acd386745aa5ee64574b1170fb858ae18 Mon Sep 17 00:00:00 2001
From: Omid Reza Vasheghani Farahani <omidrezav@gmail.com>
Date: Fri, 16 Sep 2022 17:38:23 +0430
Subject: [PATCH 1/2] Added diff method

---
 src/Jalalian.php       | 31 +++++++++++++++++++++++
 tests/JalalianTest.php | 56 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 87 insertions(+)

diff --git a/src/Jalalian.php b/src/Jalalian.php
index e57e86c..e859a63 100644
--- a/src/Jalalian.php
+++ b/src/Jalalian.php
@@ -754,4 +754,35 @@ public function getWeekOfMonth(): int
     {
         return floor(($this->day + 5 - $this->getDayOfWeek()) / 7) + 1;
     }
+
+    public function diff(Jalalian $ref): array
+    {
+        if ($this->equalsTo($ref)) {
+            return [0, 0, 0];
+        }
+
+        $biggerDate = $this->greaterThan($ref) ? $this : $ref;
+        $biggerYear = $biggerDate->getYear();
+        $biggerMonth = $biggerDate->getMonth();
+        $biggerDay = $biggerDate->getDay();
+        $smallerDate = $this->greaterThan($ref) ? $ref : $this;
+        $smallerYear = $smallerDate->getYear();
+        $smallerMonth = $smallerDate->getMonth();
+        $smallerDay = $smallerDate->getDay();
+
+        $yearDiff = $biggerYear - $smallerYear;
+        $monthDiff = $biggerMonth - $smallerMonth;
+        $dayDiff = $biggerDay - $smallerDay;
+        if ($dayDiff < 0) {
+            $dayDiff = $biggerDay +
+                $smallerDate->getEndDayOfMonth()->getDay() - $smallerDate->getDay();
+            $monthDiff--;
+        }
+        if ($monthDiff < 0) {
+            $monthDiff += 12;
+            $yearDiff--;
+        }
+
+        return [$yearDiff, $monthDiff, $dayDiff];
+    }
 }
diff --git a/tests/JalalianTest.php b/tests/JalalianTest.php
index b22ca09..3e308ab 100644
--- a/tests/JalalianTest.php
+++ b/tests/JalalianTest.php
@@ -370,4 +370,60 @@ public function testGetQuarter()
         $jDate = new Jalalian(1402, 7, 23);
         $this->assertEquals(3, $jDate->getQuarter());
     }
+
+    public function testdiff()
+    {
+        $jDate = new Jalalian(1401, 6, 26);
+
+        //same day
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 6, 26)), [0, 0, 0]);
+
+        //year before
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 6, 25)), [0, 0, 1]);
+
+        //day after
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 6, 27)), [0, 0, 1]);
+
+        //same montt, same year, before
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 6, 24)), [0, 0, 2]);
+
+        //same month, same year, after
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 6, 28)), [0, 0, 2]);
+
+        //same year, before, smaller day
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 4, 12)), [0, 2, 14]);
+
+        //same year, before, greater day
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 4, 27)), [0, 1, 30]);
+
+        //same year, after, smaller day
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 9, 10)), [0, 2, 15]);
+
+        //same year, after, greater day
+        $this->assertEquals($jDate->diff(new Jalalian(1401, 10, 28)), [0, 4, 2]);
+
+        //previous year, smaller month, smaller day
+        $this->assertEquals($jDate->diff(new Jalalian(1389, 4, 12)), [12, 2, 14]);
+
+        //previous year, smaller month, greater day
+        $this->assertEquals($jDate->diff(new Jalalian(1395, 4, 29)), [6, 1, 28]);
+
+        //previous year, greater month, smaller day
+        $this->assertEquals($jDate->diff(new Jalalian(1395, 9, 10)), [5, 9, 16]);
+
+        //previous year, greater month, greater day
+        $this->assertEquals($jDate->diff(new Jalalian(1395, 9, 30)), [5, 8, 26]);
+
+        //greater year, smaller month, smaller day
+        $this->assertEquals($jDate->diff(new Jalalian(1402, 4, 12)), [0, 9, 17]);
+
+        //greater year, smaller month, greater day
+        $this->assertEquals($jDate->diff(new Jalalian(1403, 4, 29)), [1, 10, 3]);
+
+        //greater year, greater month, smaller day
+        $this->assertEquals($jDate->diff(new Jalalian(1405, 9, 10)), [4, 2, 15]);
+
+        //greater year, greater month, greater day
+        $this->assertEquals($jDate->diff(new Jalalian(1405, 9, 30)), [4, 3, 4]);
+    }
 }

From c972a69934deb6251ef124705e553a4e4bd45ebe Mon Sep 17 00:00:00 2001
From: Omid Reza Vasheghani Farahani <omidrezav@gmail.com>
Date: Fri, 16 Sep 2022 17:38:58 +0430
Subject: [PATCH 2/2] Updated readme and added getLastDayOfMonth,
 getLastDayOfYear and diff methods

---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index 99a2b18..7f80316 100644
--- a/README.md
+++ b/README.md
@@ -639,7 +639,12 @@ public function getNextMonth(): Jalalian
 ```
 
 ---
+```php
+public function diff(Jalalian $ref): array
+$diff = (new Jalalian(1397, 5, 24))->diff(new Jalalian(1398, 6, 30));
+// output: [1, 1, 6]
 
+```
 ### CalendarUtils
 ---