the start and end of a day can be created

Stdlib/Base/SmartDateTime.php

@@ -194,6 +194,30 @@ class SmartDateTime extends \DateTime
         return \getdate(\mktime(0, 0, 0, (int) $this->format('m'), 1, (int) $this->format('Y')))['wday'];
     }
 
+    /**
+     * Get the end of the day
+     *
+     * @return SmartDateTime
+     *
+     * @since 1.0.0
+     */
+    public function getEndOfDay() : self
+    {
+        return new self(\date('Y-m-d', $this->getTimestamp()) . ' 23:59:59');
+    }
+
+    /**
+     * Get the start of the day
+     *
+     * @return SmartDateTime
+     *
+     * @since 1.0.0
+     */
+    public function getStartOfDay() : self
+    {
+        return new self(\date('Y-m-d', $this->getTimestamp()) . ' 00:00:00');
+    }
+
     /**
      * Is leap year in gregorian calendar
      *

tests/Stdlib/Base/SmartDateTimeTest.php

@@ -154,6 +154,32 @@ class SmartDateTimeTest extends \PHPUnit\Framework\TestCase
         self::assertEquals($expected->format('Y-m-d'), $obj->getStartOfWeek()->format('Y-m-d'));
     }
 
+    /**
+     * @testdox A smart datetime can be returned of the end of the day
+     * @covers phpOMS\Stdlib\Base\SmartDateTime
+     * @group framework
+     */
+    public function testEndOfDay() : void
+    {
+        $expected = new \DateTime('2019-11-17');
+        $obj      = new SmartDateTime('2019-11-21');
+
+        self::assertEquals($expected->format('Y-m-d')  . '23:59:59', $obj->getEndOfDay()->format('Y-m-d H:i:s'));
+    }
+
+    /**
+     * @testdox A smart datetime can be returned of the start of the day
+     * @covers phpOMS\Stdlib\Base\SmartDateTime
+     * @group framework
+     */
+    public function testStartOfDay() : void
+    {
+        $expected = new \DateTime('2019-11-17');
+        $obj      = new SmartDateTime('2019-11-21');
+
+        self::assertEquals($expected->format('Y-m-d')  . '00:00:00', $obj->getStartOfDay()->format('Y-m-d H:i:s'));
+    }
+
     /**
      * @testdox A date or year can be checked if it is a leap year
      * @covers phpOMS\Stdlib\Base\SmartDateTime