diff --git a/dashed/models.py b/dashed/models.py
index 1db3fd62d12..025806ad041 100644
--- a/dashed/models.py
+++ b/dashed/models.py
@@ -285,6 +285,10 @@ class Database(Model, AuditMixinNullable):
                 Grain('Time Column', '{col}'),
                 Grain('week', "date_trunc('week', CAST({col} AS DATE))"),
                 Grain('month', "date_trunc('month', CAST({col} AS DATE))"),
+                Grain("week_ending_saturday", "date_add('day', 5, "
+                      "date_trunc('week', date_add('day', 1, CAST({col} AS DATE))))"),
+                Grain("week_start_sunday", "date_add('day', -1, "
+                      "date_trunc('week', date_add('day', 1, CAST({col} AS DATE))))")
             ),
             'mysql': (
                 Grain('Time Column', '{col}'),