diff --git a/README.md b/README.md
index 7b85b0c..30bbf46 100644
--- a/README.md
+++ b/README.md
@@ -644,6 +644,20 @@ public function diff(Jalalian $ref): array
 $diff = (new Jalalian(1397, 5, 24))->diff(new Jalalian(1398, 6, 30));
 // output: [1, 1, 6]
 
+```
+---
+```php
+public function next(string $dayName):Jalalian
+$next = (new Jalalian(1403, 5, 22))->next('شنبه')->format('Y-m-d');
+// output: 1403-05-27
+
+```
+---
+```php
+public function previous(string $dayName):Jalalian
+$previous = (new Jalalian(1403, 5, 22))->previous('شنبه')->format('Y-m-d');
+// output: 1403-05-20
+
 ```
 ### CalendarUtils
 ---
diff --git a/src/Converter.php b/src/Converter.php
index 8208a21..78ca211 100644
--- a/src/Converter.php
+++ b/src/Converter.php
@@ -2,6 +2,7 @@
 
 namespace Morilog\Jalali;
 
+use Carbon\CarbonInterface;
 use Carbon\Exceptions\UnitException;
 use Date;
 
@@ -141,4 +142,29 @@ public function toFormattedMonthYearString()
         return $this->format('F Y');
     }
 
+    /**
+     * Change persian day name to CarbonInterface
+     * 
+     * @param string $modifier
+     * 
+     * @return int
+     */
+    public function toCarbonDayName(string $modifier): int
+    {
+        $carbonDayModifiers = [
+            'شنبه'  => CarbonInterface::SATURDAY,
+            'یکشنبه' => CarbonInterface::SUNDAY,
+            'دوشنبه' => CarbonInterface::MONDAY,
+            'سه‌شنبه' => CarbonInterface::TUESDAY,
+            'چهارشنبه' => CarbonInterface::WEDNESDAY,
+            'پنج‌شنبه' => CarbonInterface::THURSDAY,
+            'جمعه' => CarbonInterface::FRIDAY,
+        ];
+
+        if (!isset($carbonDayModifiers[$modifier])) {
+            throw new \InvalidArgumentException('Modifier expected among: شنبه, یکشنبه, دوشنبه, سه‌شنبه, چهارشنبه, پنج‌شنبه و جمعه.');
+        }
+
+        return $carbonDayModifiers[$modifier];
+    }
 }
diff --git a/src/Jalalian.php b/src/Jalalian.php
index e859a63..75738ab 100644
--- a/src/Jalalian.php
+++ b/src/Jalalian.php
@@ -125,7 +125,7 @@ public static function fromDateTime($dateTime, \DateTimeZone $timeZone = null):
 
         return static::fromCarbon(new Carbon($dateTime, $timeZone));
     }
-    
+
     public function getFirstDayOfWeek(): Jalalian
     {
         return (new static(
@@ -785,4 +785,22 @@ public function diff(Jalalian $ref): array
 
         return [$yearDiff, $monthDiff, $dayDiff];
     }
+
+    /**
+     * @param string $dayName One of: شنبه, یکشنبه, دوشنبه, سه‌شنبه, چهارشنبه, پنج‌شنبه, جمعه
+     * @return Jalalian
+     */
+    public function next(string $dayName): Jalalian
+    {
+        return $this->fromCarbon($this->toCarbon()->next($this->toCarbonDayName($dayName)));
+    }
+
+    /**
+     * @param string $dayName One of: شنبه, یکشنبه, دوشنبه, سه‌شنبه, چهارشنبه, پنج‌شنبه, جمعه
+     * @return Jalalian
+     */
+    public function previous(string $dayName): Jalalian
+    {
+        return $this->fromCarbon($this->toCarbon()->previous($this->toCarbonDayName($dayName)));
+    }
 }
diff --git a/tests/JalalianTest.php b/tests/JalalianTest.php
index 3e308ab..3c22047 100644
--- a/tests/JalalianTest.php
+++ b/tests/JalalianTest.php
@@ -426,4 +426,16 @@ public function testdiff()
         //greater year, greater month, greater day
         $this->assertEquals($jDate->diff(new Jalalian(1405, 9, 30)), [4, 3, 4]);
     }
+
+    public function testNext()
+    {
+        $jDate = new Jalalian(1403, 05, 28);
+        $this->assertEquals('1403-05-30', $jDate->next('سه‌شنبه')->format('Y-m-d'));
+    }
+
+    public function testPrevious()
+    {
+        $jDate = new Jalalian(1403, 05, 28);
+        $this->assertEquals('1403-05-22', $jDate->previous('دوشنبه')->format('Y-m-d'));
+    }
 }