diff --git a/.gitignore b/.gitignore
index 44fccc5..8b40964 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,4 @@ reports/
 build/
 coverage/
 .idea/
-
+composer.lock
diff --git a/composer.json b/composer.json
index dbf6683..c2f6e12 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "hughgrigg/php-business-time",
     "description": "Business time / working days extension for Carbon dates",
-    "version": "1.1.1",
+    "version": "1.1.2",
     "type": "library",
     "require": {
         "php": "^7.0",
diff --git a/src/Interval.php b/src/Interval.php
index 6fa5ca3..046ea66 100644
--- a/src/Interval.php
+++ b/src/Interval.php
@@ -81,21 +81,36 @@ public function forHumans($short = false): string
      * Normalise instance creation to seconds.
      *
      * @param DateInterval $dateInterval
+     * @param bool         $trimMicroseconds
      *
      * @return static
      */
-    public static function instance(DateInterval $dateInterval): self
-    {
-        return self::seconds(self::intervalToSeconds($dateInterval));
+    public static function instance(
+        DateInterval $dateInterval,
+        $trimMicroseconds = true
+    ): self {
+        return self::seconds(
+            self::intervalToSeconds($dateInterval, $trimMicroseconds)
+        );
     }
 
     /**
-     * @param DateInterval $interval
+     * @param DateInterval $dateInterval
+     * @param bool         $trimMicroseconds
      *
      * @return int
      */
-    public static function intervalToSeconds(DateInterval $interval): int
-    {
-        return (new Carbon())->add($interval)->diffInRealSeconds(new Carbon());
+    public static function intervalToSeconds(
+        DateInterval $dateInterval,
+        $trimMicroseconds = true
+    ): int {
+        $dateInterval->f =
+            $trimMicroseconds ||
+            version_compare(PHP_VERSION, '7.1.0-dev', '<') ? 0 :
+                $dateInterval->f;
+
+        return (new Carbon())->add($dateInterval)->diffInRealSeconds(
+            new Carbon()
+        );
     }
 }