diff --git a/tests/classes/DateTest.php b/tests/classes/DateTest.php
new file mode 100644
index 0000000..3983f37
--- /dev/null
+++ b/tests/classes/DateTest.php
@@ -0,0 +1,32 @@
+<?php
+
+require_once 'classes/Date.php';
+
+class DateTest extends PHPUnit_Framework_TestCase
+{
+	/**
+	 * @dataProvider providerAge
+	 */
+	public function testAge($a, $b)
+	{
+		$this->assertEquals(Date::age($a), $b);
+	}
+
+	public function providerAge()
+	{
+		ini_set('date.timezone', 'America/New_York');
+
+		$time = strtotime('-25 years');
+
+		return array(
+			array(date('Y-m-d', $time), '25'),
+			array(date('m/d/Y', $time), '25'),
+			array(date('r',     $time), '25'),
+			array('today',              '0'),
+			array('400 days ago',       '1'),
+			array(true,                 Date::age('1969-12-31')),
+		);
+	}
+}
+
+?>