Recursive Convert Dates In Where Clause (#914)

* Recursive Convert Dates In Where Clause

* Fix StyleCI

src/Jenssegers/Mongodb/Query/Builder.php

@@ -910,9 +910,19 @@ class Builder extends BaseBuilder
             }
 
             // Convert DateTime values to UTCDateTime.
-            if (isset($where['value']) and $where['value'] instanceof DateTime) {
+            if (isset($where['value'])) {
+                if (is_array($where['value'])) {
+                    array_walk_recursive($where['value'], function (&$item, $key) {
+                        if ($item instanceof DateTime) {
+                            $item = new UTCDateTime($item->getTimestamp() * 1000);
+                        }
+                    });
+                } else {
+                    if ($where['value'] instanceof DateTime) {
                         $where['value'] = new UTCDateTime($where['value']->getTimestamp() * 1000);
                     }
+                }
+            }
 
             // The next item in a "chain" of wheres devices the boolean of the
             // first item. So if we see that there are multiple wheres, we will