diff --git a/caravel/db_engine_specs.py b/caravel/db_engine_specs.py
index <HASH>..<HASH> 100644
--- a/caravel/db_engine_specs.py
+++ b/caravel/db_engine_specs.py
@@ -56,6 +56,7 @@ class PostgresEngineSpec(BaseEngineSpec):
         Grain("day", _('day'), "DATE_TRUNC('day', {col})"),
         Grain("week", _('week'), "DATE_TRUNC('week', {col})"),
         Grain("month", _('month'), "DATE_TRUNC('month', {col})"),
+        Grain("quarter", _('quarter'), "DATE_TRUNC('quarter', {col})"),
         Grain("year", _('year'), "DATE_TRUNC('year', {col})"),
     )
Add quarter time grain to postgresql (#<I>)

The timestamp returned is the start date of the period.



Reference:

<URL>