diff --git a/src/FeedIo/FeedIo.php b/src/FeedIo/FeedIo.php
index a5efde94..79bdeb96 100644
--- a/src/FeedIo/FeedIo.php
+++ b/src/FeedIo/FeedIo.php
@@ -15,6 +15,7 @@
 use FeedIo\Reader\FixerSet;
 use FeedIo\Reader\FixerAbstract;
 use FeedIo\Rule\DateTimeBuilder;
+use FeedIo\Rule\DateTimeBuilderInterface;
 use FeedIo\Adapter\ClientInterface;
 use FeedIo\Standard\Loader;
 use FeedIo\Async\Reader as AsyncReader;
@@ -109,11 +110,11 @@ class FeedIo
      * @param \FeedIo\Adapter\ClientInterface $client
      * @param \Psr\Log\LoggerInterface        $logger
      */
-    public function __construct(ClientInterface $client, LoggerInterface $logger)
+    public function __construct(ClientInterface $client, LoggerInterface $logger, DateTimeBuilderInterface $dateTimeBuilder = null)
     {
         $this->client = $client;
         $this->logger = $logger;
-        $this->dateTimeBuilder = new DateTimeBuilder($logger);
+        $this->dateTimeBuilder = $dateTimeBuilder ?? new DateTimeBuilder($logger);
         $this->setReader(new Reader($client, $logger));
         $this->loadCommonStandards();
         $this->loadFixerSet();
diff --git a/src/FeedIo/Rule/DateTimeBuilder.php b/src/FeedIo/Rule/DateTimeBuilder.php
index cc5cee11..8d8d1505 100644
--- a/src/FeedIo/Rule/DateTimeBuilder.php
+++ b/src/FeedIo/Rule/DateTimeBuilder.php
@@ -13,7 +13,7 @@
 use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
 
-class DateTimeBuilder
+class DateTimeBuilder implements DateTimeBuilderInterface
 {
     /**
      * Supported date formats
@@ -72,7 +72,7 @@ public function __construct(LoggerInterface $logger = null)
      * @param $dateFormat
      * @return DateTimeBuilder
      */
-    public function addDateFormat(string $dateFormat) : DateTimeBuilder
+    public function addDateFormat(string $dateFormat) : DateTimeBuilderInterface
     {
         $this->dateFormats[] = $dateFormat;
 
@@ -83,7 +83,7 @@ public function addDateFormat(string $dateFormat) : DateTimeBuilder
      * @param  array $dateFormats
      * @return $this
      */
-    public function setDateFormats(array $dateFormats) : DateTimeBuilder
+    public function setDateFormats(array $dateFormats) : DateTimeBuilderInterface
     {
         $this->dateFormats = $dateFormats;
 
@@ -214,7 +214,6 @@ public function setTimezone(\DateTimeZone $timezone) : void
         $this->setServerTimezone($timezone);
     }
 
-
     /**
      * @param $format
      * @param $string
diff --git a/src/FeedIo/Rule/DateTimeBuilderInterface.php b/src/FeedIo/Rule/DateTimeBuilderInterface.php
new file mode 100644
index 00000000..f3a90a40
--- /dev/null
+++ b/src/FeedIo/Rule/DateTimeBuilderInterface.php
@@ -0,0 +1,64 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of the feed-io package.
+ *
+ * (c) Alexandre Debril <alex.debril@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FeedIo\Rule;
+
+interface DateTimeBuilderInterface
+{
+ 
+    /**
+     * @param $dateFormat
+     * @return DateTimeBuilderInterface
+     */
+    public function addDateFormat(string $dateFormat) : DateTimeBuilderInterface;
+
+    /**
+     * @param  array $dateFormats
+     * @return DateTimeBuilderInterface
+     */
+    public function setDateFormats(array $dateFormats) : DateTimeBuilderInterface;
+
+    /**
+     * @return string
+     */
+    public function getLastGuessedFormat() : string;
+
+    /**
+     * Tries to guess the date's format from the list
+     * @param  string                   $date
+     * @return string|null             date Format
+     */
+    public function guessDateFormat(string $date) : ? string;
+
+    /**
+     * Creates a DateTime instance for the given string. Default format is RFC2822
+     * @param  string                   $string
+     * @return \DateTime
+     */
+    public function convertToDateTime(string $string) : \DateTime;
+
+    /**
+     * @return \DateTimeZone
+     */
+    public function getFeedTimezone() : ? \DateTimeZone;
+
+    /**
+     * Specifies the feed's timezone. Do this it the timezone is missing
+     *
+     * @param \DateTimeZone $timezone
+     */
+    public function setFeedTimezone(\DateTimeZone $timezone) : void;
+
+    /**
+     * Resets feedTimezone to null.
+     */
+    public function resetFeedTimezone() : void;
+}
+