diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ddf8b8d..19263c5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,7 +23,7 @@ jobs:
     - name: Run Tests
       run: vendor/bin/phpunit --coverage-clover ./coverage.xml
     - name: Upload Coverage
-      if: ${{ matrix.php-version == '7.4' }}
+      if: ${{ matrix.php-version == '8.0' }}
       uses: codecov/codecov-action@v1
       with:
         file: ./coverage.xml
diff --git a/README.md b/README.md
index e03b325..c74f9d1 100644
--- a/README.md
+++ b/README.md
@@ -8,19 +8,6 @@
 Official PHP library for [Holiday API](https://holidayapi.com) providing quick
 and easy access to holiday information from applications written in PHP.
 
-## Migrating from 1.x
-
-Please note, version 2.x of this library is a full rewrite of the 1.x series.
-The interfacing to the library has been simplified and existing applications
-upgrading to 2.x will need to be updated.
-
-| Version 1.x Syntax (Old)                   | Version 2.x Syntax (New)                                  |
-|--------------------------------------------|-----------------------------------------------------------|
-| `$holiday_api = new \HolidayAPI\v1($key);` | `$holiday_api = new \HolidayAPI\Client(['key' => $key]);` |
-
-Version 1.x of the library can still be found
-[here](https://github.com/joshtronic/php-holidayapi).
-
 ## Documentation
 
 Full documentation of the Holiday API endpoints is available
@@ -265,3 +252,16 @@ $holiday_api->workday([
   'days' => 7,
 ]);
 ```
+
+### Workdays
+
+#### Fetch number of workdays between two dates
+
+```php
+<?php
+$holiday_api->workdays([
+  'country' => 'US',
+  'start' => '2019-07-01',
+  'end' => '2019-07-10',
+]);
+```
diff --git a/composer.json b/composer.json
index 4b004bc..0cd3dee 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
   "name": "holidayapi/holidayapi-php",
   "description": "Official PHP library for Holiday API",
-  "version": "2.3.0",
+  "version": "2.4.0",
   "type": "library",
   "keywords": [
     "calendar",
diff --git a/src/Client.php b/src/Client.php
index f855d06..b3e295e 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -97,5 +97,18 @@ class Client
 
         return $this->request('workday', $request);
     }
+
+    public function workdays($request)
+    {
+        if (!isset($request['country'])) {
+            throw new \Exception('Missing country');
+        } elseif (!isset($request['start'])) {
+            throw new \Exception('Missing start date');
+        } elseif (!isset($request['end'])) {
+            throw new \Exception('Missing end date');
+        }
+
+        return $this->request('workdays', $request);
+    }
 }
 
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index fd368c6..e999192 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -790,5 +790,149 @@ class ClientTest extends TestCase
             $this->assertSame('Internal server error', $e->getMessage());
         }
     }
+
+    public function testReturnWorkdays()
+    {
+        $url = self::BASE_URL . 'workdays?key=' . self::KEY . '&country=US&start=2019-07-01&end=2019-07-10';
+
+        $request = new Request(array(
+            'execute' => array(
+                $url => function ()
+                {
+                    return json_encode(array(
+                        'status' => 200,
+                        'workdays' => 7,
+                    ));
+                },
+            ),
+        ));
+
+        $client = new Client(array('key' => self::KEY, 'handler' => $request));
+
+        $this->assertEquals(array(
+            'status' => 200,
+            'workdays' => 7,
+        ), $client->workdays(array(
+            'country' => 'US',
+            'start' => '2019-07-01',
+            'end' => '2019-07-10',
+        )));
+    }
+
+    public function testWorkdaysCountryMissing()
+    {
+        if (version_compare(PHP_VERSION, '7.3.0', '>=')) {
+            $assertRegExp = 'assertMatchesRegularExpression';
+        } else {
+            $assertRegExp = 'assertRegExp';
+        }
+
+        $client = new Client(array('key' => self::KEY));
+
+        try {
+            $client->workdays(array());
+        } catch (\Exception $e) {
+            $this->$assertRegExp('/missing country/i', $e->getMessage());
+        }
+    }
+
+    public function testWorkdaysStartMissing()
+    {
+        if (version_compare(PHP_VERSION, '7.3.0', '>=')) {
+            $assertRegExp = 'assertMatchesRegularExpression';
+        } else {
+            $assertRegExp = 'assertRegExp';
+        }
+
+        $client = new Client(array('key' => self::KEY));
+
+        try {
+            $client->workdays(array('country' => 'US'));
+        } catch (\Exception $e) {
+            $this->$assertRegExp('/missing start date/i', $e->getMessage());
+        }
+    }
+
+    public function testWorkdaysEndMissing()
+    {
+        if (version_compare(PHP_VERSION, '7.3.0', '>=')) {
+            $assertRegExp = 'assertMatchesRegularExpression';
+        } else {
+            $assertRegExp = 'assertRegExp';
+        }
+
+        $client = new Client(array('key' => self::KEY));
+
+        try {
+            $client->workdays(array(
+                'country' => 'US',
+                'start' => '2019-07-01',
+            ));
+        } catch (\Exception $e) {
+            $this->$assertRegExp('/missing end date/i', $e->getMessage());
+        }
+    }
+
+    public function testWorkdaysRaise4xxErrors()
+    {
+        $url = self::BASE_URL . 'workdays?key=' . self::KEY . '&country=US&start=2019-07-01&end=2019-07-10';
+
+        $request = new Request(array(
+            'execute' => array(
+                $url => function ()
+                {
+                    return json_encode(array(
+                        'status' => 429,
+                        'error' => 'Rate limit exceeded',
+                    ));
+                },
+            ),
+        ));
+
+        $client = new Client(array('key' => self::KEY, 'handler' => $request));
+
+        try {
+            $client->workdays(array(
+                'country' => 'US',
+                'start' => '2019-07-01',
+                'end' => '2019-07-10',
+            ));
+        } catch (\Exception $e) {
+            $this->assertSame(429, $e->getCode());
+            $this->assertSame('Rate limit exceeded', $e->getMessage());
+        }
+    }
+
+    public function testWorkdaysRaise5xxErrors()
+    {
+        $url = self::BASE_URL . 'workdays?key=' . self::KEY . '&country=US&start=2019-07-01&end=2019-07-10';
+
+        $request = new Request(array(
+            'execute' => array(
+                $url => function ()
+                {
+                    return false;
+                },
+            ),
+            'error' => array(
+                $url => function ()
+                {
+                    return 'Internal server error';
+                },
+            ),
+        ));
+
+        $client = new Client(array('key' => self::KEY, 'handler' => $request));
+
+        try {
+            $client->workdays(array(
+                'country' => 'US',
+                'start' => '2019-07-01',
+                'end' => '2019-07-10',
+            ));
+        } catch (\Exception $e) {
+            $this->assertSame('Internal server error', $e->getMessage());
+        }
+    }
 }