diff --git a/superset/utils/date_parser.py b/superset/utils/date_parser.py
index fa0739076a8..15e021a64c9 100644
--- a/superset/utils/date_parser.py
+++ b/superset/utils/date_parser.py
@@ -210,11 +210,11 @@ def get_since_until(
                 lambda unit: f"DATEADD(DATETIME('{_relative_start}'), -1, {unit})",
             ),
             (
-                r"^last\s+([0-9]+)\s+(second|minute|hour|day|week|month|year)s$",
+                r"^last\s+([0-9]+)\s+(second|minute|hour|day|week|month|year)s?$",
                 lambda delta, unit: f"DATEADD(DATETIME('{_relative_start}'), -{int(delta)}, {unit})",  # pylint: disable=line-too-long
             ),
             (
-                r"^next\s+([0-9]+)\s+(second|minute|hour|day|week|month|year)s$",
+                r"^next\s+([0-9]+)\s+(second|minute|hour|day|week|month|year)s?$",
                 lambda delta, unit: f"DATEADD(DATETIME('{_relative_end}'), {int(delta)}, {unit})",  # pylint: disable=line-too-long
             ),
             (
diff --git a/tests/utils/date_parser_tests.py b/tests/utils/date_parser_tests.py
index b03b612c10a..2d5cb2264de 100644
--- a/tests/utils/date_parser_tests.py
+++ b/tests/utils/date_parser_tests.py
@@ -88,10 +88,18 @@ class TestDateParser(SupersetTestCase):
         expected = datetime(2016, 6, 7), datetime(2016, 11, 7)
         self.assertEqual(result, expected)
 
+        result = get_since_until("Last 1 month")
+        expected = datetime(2016, 10, 7), datetime(2016, 11, 7)
+        self.assertEqual(result, expected)
+
         result = get_since_until("Next 5 months")
         expected = datetime(2016, 11, 7), datetime(2017, 4, 7)
         self.assertEqual(result, expected)
 
+        result = get_since_until("Next 1 month")
+        expected = datetime(2016, 11, 7), datetime(2016, 12, 7)
+        self.assertEqual(result, expected)
+
         result = get_since_until(since="5 days")
         expected = datetime(2016, 11, 2), datetime(2016, 11, 7)
         self.assertEqual(result, expected)