diff --git a/src/Dibi/DateTime.php b/src/Dibi/DateTime.php
index 18ac8cba..f0ff359d 100644
--- a/src/Dibi/DateTime.php
+++ b/src/Dibi/DateTime.php
@@ -40,21 +40,6 @@ class DateTime extends \DateTime
 	}
 
 
-	public function setTimestamp($timestamp): self
-	{
-		$zone = $this->getTimezone();
-		$this->__construct('@' . $timestamp);
-		return $this->setTimezone($zone);
-	}
-
-
-	public function getTimestamp()
-	{
-		$ts = $this->format('U');
-		return is_float($tmp = $ts * 1) ? $ts : $tmp;
-	}
-
-
 	public function __toString(): string
 	{
 		return $this->format('Y-m-d H:i:s.u');
diff --git a/tests/dibi/DateTime.phpt b/tests/dibi/DateTime.phpt
new file mode 100644
index 00000000..5621c9b0
--- /dev/null
+++ b/tests/dibi/DateTime.phpt
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+use Dibi\DateTime;
+use Tester\Assert;
+
+require __DIR__ . '/bootstrap.php';
+
+
+date_default_timezone_set('Europe/Prague');
+
+Assert::same('1978-01-23 11:40:00.000000', (string) new DateTime(254400000));
+Assert::same('1978-01-23 11:40:00.000000', (string) (new DateTime)->setTimestamp(254400000));
+Assert::same(254400000, (new DateTime(254400000))->getTimestamp());
+
+Assert::same('2050-08-13 11:40:00.000000', (string) new DateTime(2544000000));
+Assert::same('2050-08-13 11:40:00.000000', (string) (new DateTime)->setTimestamp(2544000000));
+Assert::same(is_int(2544000000) ? 2544000000 : '2544000000', (new DateTime(2544000000))->getTimestamp()); // 64 bit
+
+Assert::same('1978-05-05 00:00:00.000000', (string) new DateTime('1978-05-05'));