diff --git a/src/Timesheet/Rounding/CeilRounding.php b/src/Timesheet/Rounding/CeilRounding.php
new file mode 100644
index 00000000..c5fefa9f
--- /dev/null
+++ b/src/Timesheet/Rounding/CeilRounding.php
@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Timesheet\Rounding;
+
+use App\Entity\Timesheet;
+
+class CeilRounding implements RoundingInterface
+{
+    /**
+     * @param Timesheet $record
+     * @param int $minutes
+     */
+    public function roundBegin(Timesheet $record, $minutes)
+    {
+        if ($minutes <= 0) {
+            return;
+        }
+
+        $timestamp = $record->getBegin()->getTimestamp();
+        $seconds = $minutes * 60;
+        $diff = $timestamp % $seconds;
+
+        if (0 === $diff) {
+            return;
+        }
+
+        $record->getBegin()->setTimestamp($timestamp - $diff + $seconds);
+    }
+
+    /**
+     * @param Timesheet $record
+     * @param int $minutes
+     */
+    public function roundEnd(Timesheet $record, $minutes)
+    {
+        if ($minutes <= 0) {
+            return;
+        }
+
+        $timestamp = $record->getEnd()->getTimestamp();
+        $seconds = $minutes * 60;
+        $diff = $timestamp % $seconds;
+
+        if (0 === $diff) {
+            return;
+        }
+
+        $record->getEnd()->setTimestamp($timestamp - $diff + $seconds);
+    }
+
+    /**
+     * @param Timesheet $record
+     * @param int $minutes
+     */
+    public function roundDuration(Timesheet $record, $minutes)
+    {
+        if ($minutes <= 0) {
+            return;
+        }
+
+        $timestamp = $record->getDuration();
+        $seconds = $minutes * 60;
+        $diff = $timestamp % $seconds;
+
+        if (0 === $diff) {
+            return;
+        }
+
+        $record->setDuration($timestamp - $diff + $seconds);
+    }
+}
diff --git a/src/Timesheet/Rounding/FloorRounding.php b/src/Timesheet/Rounding/FloorRounding.php
new file mode 100644
index 00000000..3e360885
--- /dev/null
+++ b/src/Timesheet/Rounding/FloorRounding.php
@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Timesheet\Rounding;
+
+use App\Entity\Timesheet;
+
+class FloorRounding implements RoundingInterface
+{
+    /**
+     * @param Timesheet $record
+     * @param int $minutes
+     */
+    public function roundBegin(Timesheet $record, $minutes)
+    {
+        if ($minutes <= 0) {
+            return;
+        }
+
+        $timestamp = $record->getBegin()->getTimestamp();
+        $seconds = $minutes * 60;
+        $diff = $timestamp % $seconds;
+
+        if (0 === $diff) {
+            return;
+        }
+
+        $record->getBegin()->setTimestamp($timestamp - $diff);
+    }
+
+    /**
+     * @param Timesheet $record
+     * @param int $minutes
+     */
+    public function roundEnd(Timesheet $record, $minutes)
+    {
+        if ($minutes <= 0) {
+            return;
+        }
+
+        $timestamp = $record->getEnd()->getTimestamp();
+        $seconds = $minutes * 60;
+        $diff = $timestamp % $seconds;
+
+        if (0 === $diff) {
+            return;
+        }
+
+        $record->getEnd()->setTimestamp($timestamp - $diff);
+    }
+
+    /**
+     * @param Timesheet $record
+     * @param int $minutes
+     */
+    public function roundDuration(Timesheet $record, $minutes)
+    {
+        if ($minutes <= 0) {
+            return;
+        }
+
+        $timestamp = $record->getDuration();
+        $seconds = $minutes * 60;
+        $diff = $timestamp % $seconds;
+
+        if (0 === $diff) {
+            return;
+        }
+
+        $record->setDuration($timestamp - $diff);
+    }
+}
diff --git a/tests/Timesheet/Rounding/CeilRoundingTest.php b/tests/Timesheet/Rounding/CeilRoundingTest.php
new file mode 100644
index 00000000..aaaf773b
--- /dev/null
+++ b/tests/Timesheet/Rounding/CeilRoundingTest.php
@@ -0,0 +1,152 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Timesheet\Calculator;
+
+use App\Entity\Timesheet;
+use App\Timesheet\Rounding\CeilRounding;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Timesheet\Rounding\CeilRounding
+ */
+class CeilRoundingTest extends TestCase
+{
+    /**
+     * @dataProvider getTestData
+     */
+    public function testCalculate($roundBegin, $roundEnd, $roundDuration, \DateTime $start, \DateTime $end, \DateTime $expectedStart, \DateTime $expectedEnd, $expectedDuration)
+    {
+        $record = new Timesheet();
+        $record->setBegin($start);
+        $record->setEnd($end);
+        $this->assertEquals(0, $record->getDuration());
+
+        $record->setDuration($record->getEnd()->getTimestamp() - $record->getBegin()->getTimestamp());
+
+        $sut = new CeilRounding();
+        $sut->roundBegin($record, $roundBegin);
+        $sut->roundEnd($record, $roundEnd);
+        $record->setDuration($record->getEnd()->getTimestamp() - $record->getBegin()->getTimestamp());
+        $sut->roundDuration($record, $roundDuration);
+
+        $this->assertEquals($expectedStart->getTimestamp(), $record->getBegin()->getTimestamp());
+        $this->assertEquals($expectedEnd->getTimestamp(), $record->getEnd()->getTimestamp());
+        $this->assertEquals($expectedDuration, $record->getDuration());
+    }
+
+    public function getTestData()
+    {
+        $start = new \DateTime();
+        $start->setTime(12, 0, 0);
+
+        return [
+            [
+                0,
+                0,
+                0,
+                $start,
+                (clone $start)->setTimestamp($start->getTimestamp() + 1837),
+                $start,
+                (clone $start)->setTimestamp($start->getTimestamp() + 1837),
+                1837
+            ],
+            [
+                15,
+                15,
+                0,
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                (clone $start)->setTime(12, 30, 00),
+                (clone $start)->setTime(13, 45, 00),
+                4500
+            ],
+            [
+                0,
+                0,
+                0,
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                4517
+            ],
+            [
+                1,
+                1,
+                0,
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                (clone $start)->setTime(12, 18, 00),
+                (clone $start)->setTime(13, 33, 00),
+                4500
+            ],
+            [
+                0,
+                0,
+                30,
+                (clone $start)->setTime(12, 10, 51),
+                (clone $start)->setTime(14, 40, 52),
+                (clone $start)->setTime(12, 10, 51),
+                (clone $start)->setTime(14, 40, 52),
+                10800
+            ],
+            [
+                0,
+                1,
+                30,
+                (clone $start)->setTime(12, 27, 35), // 12:15
+                (clone $start)->setTime(14, 32, 52), // 14:33 => 2:18 => 2:30
+                (clone $start)->setTime(12, 27, 35),
+                (clone $start)->setTime(14, 33, 00),
+                9000
+            ],
+            [
+                15,
+                0,
+                30,
+                (clone $start)->setTime(12, 27, 35), // 12:15
+                (clone $start)->setTime(14, 32, 52), // 14:33 => 2:18 (second duration will not be rounded)
+                (clone $start)->setTime(12, 30, 00), // 12:15
+                (clone $start)->setTime(14, 32, 52), // 14:33 => 2:18 (second duration will not be rounded)
+                9000
+            ],
+            [
+                0,
+                0,
+                1,
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                0
+            ],
+            [
+                1,
+                1,
+                1,
+                (clone $start)->setTime(12, 27, 00), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 00), // ... that no rounding is applied
+                (clone $start)->setTime(12, 27, 00), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 00), // ... that no rounding is applied
+                0
+            ],
+            [
+                0,
+                0,
+                0,
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                0
+            ],
+        ];
+    }
+}
diff --git a/tests/Timesheet/Rounding/FloorRoundingTest.php b/tests/Timesheet/Rounding/FloorRoundingTest.php
new file mode 100644
index 00000000..20201940
--- /dev/null
+++ b/tests/Timesheet/Rounding/FloorRoundingTest.php
@@ -0,0 +1,152 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Timesheet\Calculator;
+
+use App\Entity\Timesheet;
+use App\Timesheet\Rounding\FloorRounding;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Timesheet\Rounding\FloorRounding
+ */
+class FloorRoundingTest extends TestCase
+{
+    /**
+     * @dataProvider getTestData
+     */
+    public function testCalculate($roundBegin, $roundEnd, $roundDuration, \DateTime $start, \DateTime $end, \DateTime $expectedStart, \DateTime $expectedEnd, $expectedDuration)
+    {
+        $record = new Timesheet();
+        $record->setBegin($start);
+        $record->setEnd($end);
+        $this->assertEquals(0, $record->getDuration());
+
+        $record->setDuration($record->getEnd()->getTimestamp() - $record->getBegin()->getTimestamp());
+
+        $sut = new FloorRounding();
+        $sut->roundBegin($record, $roundBegin);
+        $sut->roundEnd($record, $roundEnd);
+        $record->setDuration($record->getEnd()->getTimestamp() - $record->getBegin()->getTimestamp());
+        $sut->roundDuration($record, $roundDuration);
+
+        $this->assertEquals($expectedStart->getTimestamp(), $record->getBegin()->getTimestamp());
+        $this->assertEquals($expectedEnd->getTimestamp(), $record->getEnd()->getTimestamp());
+        $this->assertEquals($expectedDuration, $record->getDuration());
+    }
+
+    public function getTestData()
+    {
+        $start = new \DateTime();
+        $start->setTime(12, 0, 0);
+
+        return [
+            [
+                0,
+                0,
+                0,
+                $start,
+                (clone $start)->setTimestamp($start->getTimestamp() + 1837),
+                $start,
+                (clone $start)->setTimestamp($start->getTimestamp() + 1837),
+                1837
+            ],
+            [
+                15,
+                15,
+                0,
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                (clone $start)->setTime(12, 15, 00),
+                (clone $start)->setTime(13, 30, 00),
+                4500
+            ],
+            [
+                0,
+                0,
+                0,
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                4517
+            ],
+            [
+                1,
+                1,
+                0,
+                (clone $start)->setTime(12, 17, 35),
+                (clone $start)->setTime(13, 32, 52),
+                (clone $start)->setTime(12, 17, 00),
+                (clone $start)->setTime(13, 32, 00),
+                4500
+            ],
+            [
+                0,
+                0,
+                30,
+                (clone $start)->setTime(12, 10, 51),
+                (clone $start)->setTime(14, 40, 52),
+                (clone $start)->setTime(12, 10, 51),
+                (clone $start)->setTime(14, 40, 52),
+                9000
+            ],
+            [
+                0,
+                1,
+                30,
+                (clone $start)->setTime(12, 27, 35), // 12:15
+                (clone $start)->setTime(14, 32, 52), // 14:33 => 2:18 => 2:30
+                (clone $start)->setTime(12, 27, 35),
+                (clone $start)->setTime(14, 32, 00),
+                7200
+            ],
+            [
+                15,
+                0,
+                30,
+                (clone $start)->setTime(12, 27, 35), // 12:15
+                (clone $start)->setTime(14, 32, 52), // 14:33 => 2:18 (second duration will not be rounded)
+                (clone $start)->setTime(12, 15, 00), // 12:15
+                (clone $start)->setTime(14, 32, 52), // 14:33 => 2:18 (second duration will not be rounded)
+                7200
+            ],
+            [
+                0,
+                0,
+                1,
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                0
+            ],
+            [
+                1,
+                1,
+                1,
+                (clone $start)->setTime(12, 27, 00), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 00), // ... that no rounding is applied
+                (clone $start)->setTime(12, 27, 00), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 00), // ... that no rounding is applied
+                0
+            ],
+            [
+                0,
+                0,
+                0,
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                (clone $start)->setTime(12, 27, 35), // no diff, to test ...
+                (clone $start)->setTime(12, 27, 35), // ... that no rounding is applied
+                0
+            ],
+        ];
+    }
+}