diff --git a/dj_rql/filter_cls.py b/dj_rql/filter_cls.py
index d946d3a..5501833 100644
--- a/dj_rql/filter_cls.py
+++ b/dj_rql/filter_cls.py
@@ -3,6 +3,7 @@
 #
 
 from collections import defaultdict
+from datetime import datetime
 from uuid import uuid4
 
 from django.db.models import Q
@@ -354,6 +355,9 @@ def _build_q_for_search(self, operator, str_value):
             })
 
         unquoted_value = self.remove_quotes(str_value)
+        if not unquoted_value:
+            return Q()
+
         if not unquoted_value.startswith(RQL_ANY_SYMBOL):
             unquoted_value = '*' + unquoted_value
 
@@ -802,10 +806,17 @@ def _convert_value(cls, django_field, str_value, use_repr=False):
             dt = parse_date(val)
             if dt is None:
                 raise ValueError
+            return dt
+
         elif filter_type == FilterTypes.DATETIME:
             dt = parse_datetime(val)
             if dt is None:
-                raise ValueError
+                dt = parse_date(val)
+                if dt is None:
+                    raise ValueError
+
+                return datetime(year=dt.year, month=dt.month, day=dt.day)
+            return dt
 
         elif filter_type == FilterTypes.BOOLEAN:
             if val not in (RQL_FALSE, RQL_TRUE):
diff --git a/tests/test_filter_cls/test_apply_filters.py b/tests/test_filter_cls/test_apply_filters.py
index 1761df9..38e54e8 100644
--- a/tests/test_filter_cls/test_apply_filters.py
+++ b/tests/test_filter_cls/test_apply_filters.py
@@ -253,6 +253,7 @@ def test_search():
     assert apply_filters('(search="*aN*";search="*book")') == books
     assert apply_filters('(search="*aN";search="*b*")') == books
     assert apply_filters('search=bo') == [books[0]]
+    assert apply_filters('search=""') == books
 
 
 def test_search_bad_lookup():
diff --git a/tests/test_filter_cls/test_fields_filtering.py b/tests/test_filter_cls/test_fields_filtering.py
index c7bc442..3ebe7d6 100644
--- a/tests/test_filter_cls/test_fields_filtering.py
+++ b/tests/test_filter_cls/test_fields_filtering.py
@@ -197,6 +197,7 @@ def test_published_at():
     assert filter_field(filter_name, CO.NE, '2019-02-12T10:02') == [books[1]]
     assert filter_field(filter_name, CO.LE, '2020-01-01T00:00+08:00') == books
     assert filter_field(filter_name, CO.GT, '2000-12-12T00:21:00') == books
+    assert filter_field(filter_name, CO.GT, '2000-12-12') == books
 
 
 @pytest.mark.django_db
@@ -396,7 +397,7 @@ def test_date_field_fail(filter_name, bad_value):
 
 
 @pytest.mark.parametrize('bad_value', [
-    '2019-02-12', '0', 'date', '2019-02-12T27:00:00', '2019-02-12T21:00:00K',
+    '0', 'date', '2019-02-12T27:00:00', '2019-02-12T21:00:00K',
 ])
 @pytest.mark.parametrize('filter_name', ['published.at'])
 def test_datetime_field_fail(filter_name, bad_value):