Cross-database date macro

.changes/unreleased/Features-20240501-091604.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: Cross-database `date` macro
+time: 2024-05-01T09:16:04.909686-06:00
+custom:
+  Author: dbeatty10
+  Issue: https://github.com/dbt-labs/dbt-core/issues/8831

dbt-tests-adapter/dbt/tests/adapter/utils/fixture_date.py

@@ -0,0 +1,45 @@
+# date
+
+models__test_date_sql = """
+with generated_dates as (
+
+    {{
+        dbt.date_spine(
+            "day",
+            date(2023, 9, 7),
+            date(2023, 9, 10),
+        )
+    }}
+
+),
+
+expected_dates as (
+
+    select cast('2023-09-07' as date) as expected
+    union all
+    select cast('2023-09-08' as date) as expected
+    union all
+    select cast('2023-09-09' as date) as expected
+
+),
+
+joined as (
+    select
+        generated_dates.date_day,
+        expected_dates.expected
+    from generated_dates
+    full outer join expected_dates on generated_dates.date_day = expected_dates.expected
+)
+
+select * from joined
+"""
+
+models__test_date_yml = """
+version: 2
+models:
+  - name: test_date
+    data_tests:
+      - assert_equal:
+          actual: date_day
+          expected: expected
+"""

dbt-tests-adapter/dbt/tests/adapter/utils/test_date.py

@@ -0,0 +1,18 @@
+import pytest
+
+from dbt.tests.adapter.utils import base_utils, fixture_date
+
+
+class BaseDate(base_utils.BaseUtils):
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "test_date.yml": fixture_date.models__test_date_yml,
+            "test_date.sql": self.interpolate_macro_namespace(
+                fixture_date.models__test_date_sql, "date"
+            ),
+        }
+
+
+class TestDate(BaseDate):
+    pass

dbt/include/global_project/macros/utils/date.sql

@@ -0,0 +1,10 @@
+{% macro date(year, month, day) %}
+  {{ return(adapter.dispatch('date', 'dbt') (year, month, day)) }}
+{% endmacro %}
+
+
+{% macro default__date(year, month, day) -%}
+    {%- set dt = modules.datetime.date(year, month, day) -%}
+    {%- set iso_8601_formatted_date = dt.strftime('%Y-%m-%d') -%}
+    to_date('{{ iso_8601_formatted_date }}', 'YYYY-MM-DD')
+{%- endmacro %}