diff --git a/src/DruidFamiliar/QueryParameters/SimpleGroupByQueryParameters.php b/src/DruidFamiliar/QueryParameters/SimpleGroupByQueryParameters.php
index 7d9e49b..f65d00b 100644
--- a/src/DruidFamiliar/QueryParameters/SimpleGroupByQueryParameters.php
+++ b/src/DruidFamiliar/QueryParameters/SimpleGroupByQueryParameters.php
@@ -5,6 +5,7 @@
 use DruidFamiliar\Abstracts\AbstractTaskParameters;
 use DruidFamiliar\Exception\MissingParametersException;
 use DruidFamiliar\Interfaces\IDruidQueryParameters;
+use DruidFamiliar\DruidTime;
 use DruidFamiliar\Interval;
 
 /**
@@ -227,11 +228,34 @@ public function setIntervals(Interval $intervals)
     }
 
     /**
-     * @param Interval $intervals
+     * @param string|\DateTime|DruidTime $intervalStart
+     * @param string|\DateTime|DruidTime $intervalEnd
      */
     public function setIntervalByStartAndEnd($intervalStart, $intervalEnd)
     {
-        $this->intervals = new Interval($intervalStart, $intervalEnd);
+        $this->setIntervals(new Interval($intervalStart, $intervalEnd));
     }
 
+    /**
+     * Adjusts the datetime to make the interval "exclusive" of the datetime.
+     * e.g., given
+     * startDateTime=2014-06-18T12:30:01Z and
+     * endDateTime=2014-06-18T01:00:00Z
+     * return and Interval containing
+     * startDateTime=2014-06-18T12:30:00Z and
+     * endDateTime=2014-06-18T01:00:01Z
+     *
+     * @param $startDateTime
+     * @param $endDateTime
+     * @return void
+     */
+    public function setIntervalForQueryingUsingExclusiveTimes($startDateTime, $endDateTime)
+    {
+        $adjustedStartDateTime = new \DateTime($startDateTime);
+        $adjustedStartDateTime->sub(new \DateInterval('PT1S'));
+        $adjustedEndDateTime = new \DateTime($endDateTime);
+        $adjustedEndDateTime->add(new \DateInterval('PT1S'));
+
+        $this->setIntervals(new Interval($adjustedStartDateTime, $adjustedEndDateTime));
+    }
 }
\ No newline at end of file
diff --git a/tests/DruidFamiliar/Test/QueryParameters/SimpleGroupByQueryParametersTest.php b/tests/DruidFamiliar/Test/QueryParameters/SimpleGroupByQueryParametersTest.php
new file mode 100644
index 0000000..2184923
--- /dev/null
+++ b/tests/DruidFamiliar/Test/QueryParameters/SimpleGroupByQueryParametersTest.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace DruidFamiliar\Test\QueryParameters;
+
+use DruidFamiliar\Interval;
+use PHPUnit_Framework_TestCase;
+
+class SimpleGroupByQueryParametersTest extends PHPUnit_Framework_TestCase
+{
+
+    public function testAdjustTimeIntervalForQueryingSuccessfullyBuildsExclusiveTimes()
+    {
+        $query = $this->getMockBuilder('DruidFamiliar\QueryParameters\SimpleGroupByQueryParameters')
+            ->setMethods(null)
+            ->getMock();
+
+        $origStartDateTime = '2014-06-18T12:30:01Z';
+        $origEndDateTime = '2014-06-18T01:00:00Z';
+
+        $expectedResults = new Interval('2014-06-18T12:30:00Z', '2014-06-18T01:00:01Z');
+
+        $query->setIntervalForQueryingUsingExclusiveTimes($origStartDateTime, $origEndDateTime);
+        $results = $query->getIntervals();
+        $this->assertEquals($expectedResults, $results);
+    }
+
+}
\ No newline at end of file