diff --git a/README.md b/README.md
index b781c79..43b7846 100644
--- a/README.md
+++ b/README.md
@@ -133,6 +133,37 @@ use Coduo\PHPHumanizer\Number;
 echo Number::metricSuffix(1240000, 'pl'); // "1,24M"
 ```
 
+## Date time
+
+**Difference**
+
+```php
+use Coduo\PHPHumanizer\DateTime;
+
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 13:00:00"); // just now
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 13:00:05"); // 5 seconds from now
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 12:59:00"); // 1 minute ago
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 12:45:00"); // 15 minutes ago
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 13:15:00"); // 15 minutes from now
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 14:00:00"); // 1 hour from now
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 15:00:00"); // 2 hours from now
+echo DateTime::difference(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 12:00:00"); // 1 hour ago
+echo DateTime::difference(new \DateTime("2014-04-26"), new \DateTime("2014-04-25"); // 1 day ago
+echo DateTime::difference(new \DateTime("2014-04-26"), new \DateTime("2014-04-24"); // 2 days ago
+echo DateTime::difference(new \DateTime("2014-04-26"), new \DateTime("2014-04-28"); // 2 days from now
+echo DateTime::difference(new \DateTime("2014-04-01"), new \DateTime("2014-04-15"); // 2 weeks from now
+echo DateTime::difference(new \DateTime("2014-04-15"), new \DateTime("2014-04-07"); // 1 week ago
+echo DateTime::difference(new \DateTime("2014-01-01"), new \DateTime("2014-04-01"); // 3 months from now
+echo DateTime::difference(new \DateTime("2014-05-01"), new \DateTime("2014-04-01"); // 1 month ago
+echo DateTime::difference(new \DateTime("2015-05-01"), new \DateTime("2014-04-01"); // 1 year ago
+echo DateTime::difference(new \DateTime("2014-05-01"), new \DateTime("2016-04-01"); // 2 years from now
+
+```
+
+Currently we support following languages:
+* [English](src/Coduo/PHPHumanizer/Resources/translations/difference.en.yml)
+* [Polish](src/Coduo/PHPHumanizer/Resources/translations/difference.pl.yml)
+
 # Credits
 
 This lib was inspired by [Java Humanize Lib](https://github.com/mfornos/humanize) && [Rails Active Support](https://github.com/rails/rails/tree/master/activesupport/lib/active_support)
diff --git a/composer.json b/composer.json
index 172bcf6..807818f 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,9 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "symfony/intl": "~2.3"
+        "symfony/intl": "~2.3",
+        "symfony/config": "~2.3",
+        "symfony/translation": "~2.3"
     },
     "require-dev": {
         "phpspec/phpspec": "2.0.*"
diff --git a/spec/Coduo/PHPHumanizer/DateTime/DifferenceSpec.php b/spec/Coduo/PHPHumanizer/DateTime/DifferenceSpec.php
new file mode 100644
index 0000000..dc41b9e
--- /dev/null
+++ b/spec/Coduo/PHPHumanizer/DateTime/DifferenceSpec.php
@@ -0,0 +1,106 @@
+<?php
+
+namespace spec\Coduo\PHPHumanizer\DateTime;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
+
+class DifferenceSpec extends ObjectBehavior
+{
+    function it_calculate_diff_between_present_and_past_date_in_minutes()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 12:45:00"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Minute');
+        $this->getQuantity()->shouldReturn(15);
+        $this->isPast()->shouldReturn(true);
+    }
+
+    function it_calculate_diff_between_present_and_future_date_in_minutes()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 13:15:00"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Minute');
+        $this->getQuantity()->shouldReturn(15);
+        $this->isPast()->shouldReturn(false);
+    }
+
+    function it_calculate_diff_between_present_and_past_date_in_hours()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 11:00:00"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Hour');
+        $this->getQuantity()->shouldReturn(2);
+        $this->isPast()->shouldReturn(true);
+    }
+
+    function it_calculate_diff_between_present_and_future_date_in_hours()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-26 13:00:00"), new \DateTime("2014-04-26 16:00:00"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Hour');
+        $this->getQuantity()->shouldReturn(3);
+        $this->isPast()->shouldReturn(false);
+    }
+
+    function it_calculate_diff_between_present_and_past_date_in_days()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-10"), new \DateTime("2014-04-09"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Day');
+        $this->getQuantity()->shouldReturn(1);
+        $this->isPast()->shouldReturn(true);
+    }
+
+    function it_calculate_diff_between_present_and_future_date_in_days()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-10"), new \DateTime("2014-04-11"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Day');
+        $this->getQuantity()->shouldReturn(1);
+        $this->isPast()->shouldReturn(false);
+    }
+
+    function it_calculate_diff_between_present_and_past_date_in_weeks()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-15"), new \DateTime("2014-04-01"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Week');
+        $this->getQuantity()->shouldReturn(2);
+        $this->isPast()->shouldReturn(true);
+    }
+
+    function it_calculate_diff_between_present_and_future_date_in_weeks()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-01"), new \DateTime("2014-04-15"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Week');
+        $this->getQuantity()->shouldReturn(2);
+        $this->isPast()->shouldReturn(false);
+    }
+
+    function it_calculate_diff_between_present_and_past_date_in_months()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-01"), new \DateTime("2014-03-01"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Month');
+        $this->getQuantity()->shouldReturn(1);
+        $this->isPast()->shouldReturn(true);
+    }
+
+    function it_calculate_diff_between_present_and_future_date_in_months()
+    {
+        $this->beConstructedWith(new \DateTime("2014-04-01"), new \DateTime("2014-05-01"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Month');
+        $this->getQuantity()->shouldReturn(1);
+        $this->isPast()->shouldReturn(false);
+    }
+
+    function it_calculate_diff_between_present_and_past_date_in_years()
+    {
+        $this->beConstructedWith(new \DateTime("2014-01-01"), new \DateTime("2012-01-01"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Year');
+        $this->getQuantity()->shouldReturn(2);
+        $this->isPast()->shouldReturn(true);
+    }
+
+    function it_calculate_diff_between_present_and_future_date_in_years()
+    {
+        $this->beConstructedWith(new \DateTime("2014-01-01"), new \DateTime("2015-01-01"));
+        $this->getUnit()->shouldReturnAnInstanceOf('Coduo\PHPHumanizer\DateTime\Unit\Year');
+        $this->getQuantity()->shouldReturn(1);
+        $this->isPast()->shouldReturn(false);
+    }
+}
diff --git a/spec/Coduo/PHPHumanizer/DateTime/FormatterSpec.php b/spec/Coduo/PHPHumanizer/DateTime/FormatterSpec.php
new file mode 100644
index 0000000..97e08d8
--- /dev/null
+++ b/spec/Coduo/PHPHumanizer/DateTime/FormatterSpec.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace spec\Coduo\PHPHumanizer\DateTime;
+
+use Coduo\PHPHumanizer\DateTime\Difference;
+use Coduo\PHPHumanizer\DateTime\Unit\Minute;
+use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
+use Symfony\Component\Translation\Translator;
+
+class FormatterSpec extends ObjectBehavior
+{
+    function let(Translator $translator)
+    {
+        $this->beConstructedWith($translator);
+        $translator->transChoice(
+            'minute.past',
+            10,
+            array('%count%' => 10),
+            'difference',
+            'en'
+        )->willReturn('10 minutes ago');
+
+        $translator->transChoice(
+            'minute.past',
+            10,
+            array('%count%' => 10),
+            'difference',
+            'pl'
+        )->willReturn('10 minut temu');
+    }
+
+    function it_format_datetime_diff(Difference $diff)
+    {
+        $diff->getUnit()->willReturn(new Minute());
+        $diff->getQuantity()->willReturn(10);
+        $diff->isPast()->willReturn(true);
+        $this->formatDifference($diff)->shouldReturn('10 minutes ago');
+    }
+
+    function it_format_datetime_diff_for_specific_locale(Difference $diff)
+    {
+        $diff->getUnit()->willReturn(new Minute());
+        $diff->getQuantity()->willReturn(10);
+        $diff->isPast()->willReturn(true);
+        $this->formatDifference($diff, 'pl')->shouldReturn('10 minut temu');
+    }
+}
diff --git a/spec/Coduo/PHPHumanizer/DateTimeSpec.php b/spec/Coduo/PHPHumanizer/DateTimeSpec.php
new file mode 100644
index 0000000..8db4778
--- /dev/null
+++ b/spec/Coduo/PHPHumanizer/DateTimeSpec.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace spec\Coduo\PHPHumanizer;
+
+use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
+
+class DateTimeSpec extends ObjectBehavior
+{
+    function it_humanize_difference_between_dates()
+    {
+        $examples = array(
+            array("2014-04-26 13:00:00", "2014-04-26 13:00:00", 'just now'),
+            array("2014-04-26 13:00:00", "2014-04-26 13:00:05", '5 seconds from now'),
+            array("2014-04-26 13:00:00", "2014-04-26 12:59:00", '1 minute ago'),
+            array("2014-04-26 13:00:00", "2014-04-26 12:45:00", '15 minutes ago'),
+            array("2014-04-26 13:00:00", "2014-04-26 13:15:00", '15 minutes from now'),
+            array("2014-04-26 13:00:00", "2014-04-26 14:00:00", '1 hour from now'),
+            array("2014-04-26 13:00:00", "2014-04-26 15:00:00", '2 hours from now'),
+            array("2014-04-26 13:00:00", "2014-04-26 12:00:00", '1 hour ago'),
+            array("2014-04-26", "2014-04-25", '1 day ago'),
+            array("2014-04-26", "2014-04-24", '2 days ago'),
+            array("2014-04-26", "2014-04-28", '2 days from now'),
+            array("2014-04-01", "2014-04-15", '2 weeks from now'),
+            array("2014-04-15", "2014-04-07", '1 week ago'),
+            array("2014-01-01", "2014-04-01", '3 months from now'),
+            array("2014-05-01", "2014-04-01", '1 month ago'),
+            array("2015-05-01", "2014-04-01", '1 year ago'),
+            array("2014-05-01", "2016-04-01", '2 years from now'),
+        );
+
+        foreach ($examples as $example) {
+            $this->difference(new \DateTime($example[0]), new \DateTime($example[1]))->shouldReturn($example[2]);
+        }
+    }
+
+    function it_humanize_difference_between_dates_for_pl_locale()
+    {
+        $examples = array(
+            array("2014-04-26 13:00:00", "2014-04-26 13:00:00", 'w tym momencie'),
+            array("2014-04-26 13:00:00", "2014-04-26 13:00:05", 'za 5 sekund'),
+            array("2014-04-26 13:00:00", "2014-04-26 12:59:00", 'minutę temu'),
+            array("2014-04-26 13:00:00", "2014-04-26 12:45:00", '15 minut temu'),
+            array("2014-04-26 13:00:00", "2014-04-26 13:15:00", 'za 15 minut'),
+            array("2014-04-26 13:00:00", "2014-04-26 14:00:00", 'za godzinę'),
+            array("2014-04-26 13:00:00", "2014-04-26 15:00:00", 'za 2 godziny'),
+            array("2014-04-26 13:00:00", "2014-04-26 12:00:00", 'godzinę temu'),
+            array("2014-04-26 13:00:00", "2014-04-26 15:00:00", 'za 2 godziny'),
+            array("2014-04-26 13:00:00", "2014-04-26 12:00:00", 'godzinę temu'),
+            array("2014-04-26", "2014-04-25", 'wczoraj'),
+            array("2014-04-26", "2014-04-24", '2 dni temu'),
+            array("2014-04-26", "2014-04-28", 'za 2 dni'),
+            array("2014-04-01", "2014-04-15", 'za 2 tygodnie'),
+            array("2014-04-15", "2014-04-07", 'tydzień temu'),
+            array("2014-01-01", "2014-04-01", 'za 3 miesiące'),
+            array("2014-05-01", "2014-04-01", 'miesiąc temu'),
+            array("2015-05-01", "2014-04-01", 'rok temu'),
+            array("2014-05-01", "2016-04-01", 'za 2 lata'),
+            array("2014-05-01", "2009-04-01", '5 lat temu'),
+        );
+
+        foreach ($examples as $example) {
+            $this->difference(new \DateTime($example[0]), new \DateTime($example[1]), 'pl')->shouldReturn($example[2]);
+        }
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime.php b/src/Coduo/PHPHumanizer/DateTime.php
new file mode 100644
index 0000000..c9f3e1c
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Coduo\PHPHumanizer;
+
+use Coduo\PHPHumanizer\DateTime\Difference;
+use Coduo\PHPHumanizer\DateTime\Formatter;
+use Coduo\PHPHumanizer\Translator\Builder;
+
+class DateTime
+{
+    public static function difference(\DateTime $fromDate, \DateTime $toDate, $locale = 'en')
+    {
+        $formatter = new Formatter(Builder::build($locale));
+        return $formatter->formatDifference(new Difference($fromDate, $toDate), $locale);
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Difference.php b/src/Coduo/PHPHumanizer/DateTime/Difference.php
new file mode 100644
index 0000000..16cfe5a
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Difference.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime;
+
+use Coduo\PHPHumanizer\DateTime\Unit\Day;
+use Coduo\PHPHumanizer\DateTime\Unit\Hour;
+use Coduo\PHPHumanizer\DateTime\Unit\JustNow;
+use Coduo\PHPHumanizer\DateTime\Unit\Minute;
+use Coduo\PHPHumanizer\DateTime\Unit\Month;
+use Coduo\PHPHumanizer\DateTime\Unit\Second;
+use Coduo\PHPHumanizer\DateTime\Unit\Week;
+use Coduo\PHPHumanizer\DateTime\Unit\Year;
+
+class Difference
+{
+    /**
+     * @var \DateTime
+     */
+    private $fromDate;
+
+    /**
+     * @var \DateTime
+     */
+    private $toDate;
+
+    /**
+     * @var \Coduo\PHPHumanizer\DateTime\Unit
+     */
+    private $unit;
+
+    /**
+     * @var int
+     */
+    private $quantity;
+
+    public function __construct(\DateTime $fromDate, \DateTime $toDate)
+    {
+        $this->fromDate = $fromDate;
+        $this->toDate = $toDate;
+        $this->calculate();
+    }
+
+    /**
+     * @return Unit
+     */
+    public function getUnit()
+    {
+        return $this->unit;
+    }
+
+    /**
+     * @return int
+     */
+    public function getQuantity()
+    {
+        return $this->quantity;
+    }
+
+    private function calculate()
+    {
+        /* @var $units \Coduo\PHPHumanizer\DateTime\Unit[] */
+        $units = array(
+            new Year(),
+            new Month(),
+            new Week(),
+            new Day(),
+            new Hour(),
+            new Minute(),
+            new Second(),
+            new JustNow()
+        );
+
+        $absoluteMilliSecondsDiff = abs($this->toDate->getTimestamp() - $this->fromDate->getTimestamp()) * 1000;
+        foreach ($units as $unit) {
+            if ($absoluteMilliSecondsDiff >= $unit->getMilliseconds()) {
+                $this->unit = $unit;
+                break;
+            }
+        }
+
+
+        $this->quantity = ($absoluteMilliSecondsDiff == 0)
+            ? $absoluteMilliSecondsDiff
+            : (int) round($absoluteMilliSecondsDiff / $this->unit->getMilliseconds());
+    }
+
+    public function isPast()
+    {
+        $diff = $this->toDate->getTimestamp() - $this->fromDate->getTimestamp();
+        return ($diff > 0) ? false : true;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Formatter.php b/src/Coduo/PHPHumanizer/DateTime/Formatter.php
new file mode 100644
index 0000000..fc6b692
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Formatter.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime;
+
+use Symfony\Component\Translation\TranslatorInterface;
+
+class Formatter
+{
+    /**
+     * @var \Symfony\Component\Translation\TranslatorInterface
+     */
+    private $translator;
+
+    /**
+     * @param TranslatorInterface $translator
+     */
+    public function __construct(TranslatorInterface $translator)
+    {
+        $this->translator = $translator;
+    }
+
+    /**
+     * @param Difference $difference
+     * @param string $locale
+     * @return string
+     */
+    public function formatDifference(Difference $difference, $locale = 'en')
+    {
+        $translationKey = sprintf('%s.%s', $difference->getUnit()->getName(), $difference->isPast() ? 'past' : 'future');
+
+        return $this->translator->transChoice(
+            $translationKey,
+            $difference->getQuantity(),
+            array('%count%' => $difference->getQuantity()),
+            'difference',
+            $locale
+        );
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit.php b/src/Coduo/PHPHumanizer/DateTime/Unit.php
new file mode 100644
index 0000000..2957975
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime;
+
+interface Unit
+{
+    /**
+     * @return string
+     */
+    public function getName();
+
+    /**
+     * Return millisecond that represents unit.
+     *
+     * @return int
+     */
+    public function getMilliseconds();
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Day.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Day.php
new file mode 100644
index 0000000..7a802fa
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Day.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class Day implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'day';
+    }
+
+    public function getMilliseconds()
+    {
+        $hour = new Hour();
+        return $hour->getMilliseconds() * 24;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Hour.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Hour.php
new file mode 100644
index 0000000..c5134ed
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Hour.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class Hour implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'hour';
+    }
+
+    public function getMilliseconds()
+    {
+        $minute = new Minute();
+        return $minute->getMilliseconds() * 60;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/JustNow.php b/src/Coduo/PHPHumanizer/DateTime/Unit/JustNow.php
new file mode 100644
index 0000000..3343d30
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/JustNow.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class JustNow implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'just_now';
+    }
+
+    public function getMilliseconds()
+    {
+        return 0;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Minute.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Minute.php
new file mode 100644
index 0000000..75ae282
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Minute.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class Minute implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'minute';
+    }
+
+    public function getMilliseconds()
+    {
+        $second = new Second();
+
+        return $second->getMilliseconds() * 60;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Month.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Month.php
new file mode 100644
index 0000000..a4cd816
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Month.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class Month implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'month';
+    }
+
+    public function getMilliseconds()
+    {
+        $day = new Day();
+        return $day->getMilliseconds() * 30;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Second.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Second.php
new file mode 100644
index 0000000..07ca8f8
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Second.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class Second implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'second';
+    }
+
+    public function getMilliseconds()
+    {
+        return 1000;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Week.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Week.php
new file mode 100644
index 0000000..2225767
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Week.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class Week implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'week';
+    }
+
+    public function getMilliseconds()
+    {
+        $day = new Day();
+        return $day->getMilliseconds() * 7;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Year.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Year.php
new file mode 100644
index 0000000..f094402
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Year.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Coduo\PHPHumanizer\DateTime\Unit;
+
+use Coduo\PHPHumanizer\DateTime\Unit;
+
+class Year implements Unit
+{
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return 'year';
+    }
+
+    public function getMilliseconds()
+    {
+        $day = new Day();
+        return $day->getMilliseconds() * 356;
+    }
+}
diff --git a/src/Coduo/PHPHumanizer/Resources/translations/difference.en.yml b/src/Coduo/PHPHumanizer/Resources/translations/difference.en.yml
new file mode 100644
index 0000000..ef82aa3
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/Resources/translations/difference.en.yml
@@ -0,0 +1,24 @@
+just_now:
+  past: "just now"
+  future: "just now"
+second:
+  past: "{1} %count% second ago|[2,Inf] %count% seconds ago"
+  future: "{1} %count% second from now|[2,Inf] %count% seconds from now"
+minute:
+  past: "{1} %count% minute ago|[2,Inf] %count% minutes ago"
+  future: "{1} %count% minute from now|[2,Inf] %count% minutes from now"
+hour:
+  past: "{1} %count% hour ago|[2,Inf] %count% hours ago"
+  future: "{1} %count% hour from now|[2,Inf] %count% hours from now"
+day:
+  past: "{1} %count% day ago|[2,Inf] %count% days ago"
+  future: "{1} %count% day from now|[2,Inf] %count% days from now"
+week:
+  past: "{1} %count% week ago|[2,Inf] %count% weeks ago"
+  future: "{1} %count% week from now|[2,Inf] %count% weeks from now"
+month:
+  past: "{1} %count% month ago|[2,Inf] %count% months ago"
+  future: "{1} %count% month from now|[2,Inf] %count% months from now"
+year:
+  past: "{1} %count% year ago|[2,Inf] %count% years ago"
+  future: "{1} %count% year from now|[2,Inf] %count% years from now"
diff --git a/src/Coduo/PHPHumanizer/Resources/translations/difference.pl.yml b/src/Coduo/PHPHumanizer/Resources/translations/difference.pl.yml
new file mode 100644
index 0000000..da237d8
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/Resources/translations/difference.pl.yml
@@ -0,0 +1,24 @@
+just_now:
+  past: "w tym momencie"
+  future: "w tym momencie"
+second:
+  past: "{1} sekundę temu|[2, 4] %count% sekundy temu|[5,Inf] %count% sekund temu"
+  future: "{1} za sekundę|[2, 4] za %count% sekund|[5,Inf] za %count% sekund"
+minute:
+  past: "{1} minutę temu|[2, 4] %count% minuty temu|[5,Inf] %count% minut temu"
+  future: "{1} za minutę|[2, 4] za %count% minuty|[5,Inf] za %count% minut"
+hour:
+  past: "{1} godzinę temu|[2, 4] %count% godziny temu|[5,Inf] %count% godzin temu"
+  future: "{1} za godzinę|[2, 4] za %count% godziny|[5,Inf] za %count% godzin"
+day:
+  past: "{1} wczoraj|[2, Inf] %count% dni temu"
+  future: "{1} jutro|[2, Inf] za %count% dni"
+week:
+  past: "{1} tydzień temu|[2, 4] %count% tygodnie temu|[5,Inf] %count% tygodni temu"
+  future: "{1} za tydzień|[2, 4] za %count% tygodnie|[5,Inf] za %count% tygodni"
+month:
+  past: "{1} miesiąc temu|[2, 4] %count% miesiące temu|[5,Inf] %count% miesięcy temu"
+  future: "{1} za miesiąc|[2, 4] za %count% miesiące|[5,Inf] za %count% miesięcy"
+year:
+  past: "{1} rok temu|[2, 4] %count% lata temu|[5,Inf] %count% lat temu"
+  future: "{1} za rok|[2, 4] za %count% lata|[5,Inf] za %count% lat"
diff --git a/src/Coduo/PHPHumanizer/Translator/Builder.php b/src/Coduo/PHPHumanizer/Translator/Builder.php
new file mode 100644
index 0000000..da44e79
--- /dev/null
+++ b/src/Coduo/PHPHumanizer/Translator/Builder.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Coduo\PHPHumanizer\Translator;
+
+use Symfony\Component\Translation\Loader\YamlFileLoader;
+use Symfony\Component\Translation\Translator;
+
+class Builder
+{
+    public static function build($locale)
+    {
+        $translator = new Translator($locale);
+        $translator->addLoader('yml', new YamlFileLoader());
+
+        $iterator = new \FilesystemIterator(__DIR__ . "/../Resources/translations");
+        $filter = new \RegexIterator($iterator, '/[aA-zZ]+\.[a-z]{2}\.yml$/');
+
+        foreach($filter as $file) {
+            /* @var $file \SplFileInfo */
+            $resourceName = $file->getBasename('.yml');
+            list($fileDomain, $fileLocale) = explode('.', $resourceName);
+            $translator->addResource('yml', $file->getPathname(), $fileLocale, $fileDomain);
+        }
+
+        return $translator;
+    }
+}