Add support for AGE to SQLite backend

Closes #14763

trytond/CHANGELOG

@@ -1,3 +1,4 @@
+* Add support for AGE to SQLite backend
 * Add button to mark notification as read
 
 Version 8.0.0 - 2026-04-20

trytond/trytond/backend/sqlite/database.py

@@ -218,6 +218,30 @@ def _date_trunc_interval(field, source):
     return adapt_timedelta(value)
 
 
+def age(timestamp1, timestamp2=None):
+    def convert(value):
+        for fromisoformat in [
+                dt.date.fromisoformat,
+                dt.datetime.fromisoformat,
+                ]:
+            try:
+                value = fromisoformat(value)
+            except ValueError:
+                continue
+            break
+        else:
+            raise ValueError
+        if not isinstance(value, dt.datetime):
+            value = dt.datetime.combine(value, dt.time())
+        return value
+    timestamp1 = convert(timestamp1)
+    if timestamp2 is None:
+        timestamp2 = dt.datetime.combine(dt.date.today(), dt.time())
+    else:
+        timestamp1, timestamp2 = convert(timestamp2), timestamp1
+    return adapt_timedelta(timestamp2 - timestamp1)
+
+
 def split_part(text, delimiter, count):
     if text is None:
         return None
@@ -473,6 +497,8 @@ class Database(DatabaseInterface):
             factory=SQLiteConnection)
         self._conn.create_function('extract', 2, SQLiteExtract.extract)
         self._conn.create_function('date_trunc', 2, date_trunc)
+        self._conn.create_function('age', 1, age)
+        self._conn.create_function('age', 2, age)
         self._conn.create_function('split_part', 3, split_part)
         self._conn.create_function('to_char', 2, to_char)
         self._conn.create_function('now', 0, now)

trytond/trytond/tests/test_backend.py

@@ -5,7 +5,7 @@ import math
 from decimal import Decimal
 
 from sql import Cast, Literal, Select, Table, functions
-from sql.functions import CurrentTimestamp, DateTrunc, Extract, ToChar
+from sql.functions import Age, CurrentTimestamp, DateTrunc, Extract, ToChar
 
 from trytond import backend
 from trytond.model import fields
@@ -269,6 +269,47 @@ class BackendTestCase(TestCase):
         value, = cursor.fetchone()
         self.assertEqual(value, None)
 
+    @with_transaction()
+    def test_function_age(self):
+        "Test Age function"
+        cursor = Transaction().connection.cursor()
+
+        for t1, t2, result in [
+                (dt.date(2026, 4, 13), dt.date(2026, 4, 1),
+                    dt.timedelta(days=12)),
+                (dt.date(2026, 4, 13), dt.datetime(2026, 4, 1, 12, 0),
+                    dt.timedelta(days=11, hours=12)),
+                (dt.datetime(2026, 4, 13, 12, 0), dt.date(2026, 4, 1),
+                    dt.timedelta(days=12, hours=12)),
+                (dt.datetime(2026, 4, 13, 12, 0),
+                    dt.datetime(2026, 4, 1, 12, 0),
+                    dt.timedelta(days=12)),
+                ]:
+            for t1, t2, result in [
+                    (t1, t2, result),
+                    (t2, t1, -result),
+                    ]:
+                with self.subTest(t1=t1, t2=t2):
+                    query = Select([Age(t1, t2).as_('age')])
+                    if backend.name == 'sqlite':
+                        sqlite_apply_types(query, ['INTERVAL'])
+                    cursor.execute(*query)
+                    value, = cursor.fetchone()
+                    self.assertEqual(value, result)
+
+    @with_transaction()
+    def test_function_age_current_date(self):
+        "Test Age function with current_date"
+        cursor = Transaction().connection.cursor()
+
+        today = dt.date.today()
+        query = Select([Age(today - dt.timedelta(days=10)).as_('age')])
+        if backend.name == 'sqlite':
+            sqlite_apply_types(query, ['INTERVAL'])
+        cursor.execute(*query)
+        value, = cursor.fetchone()
+        self.assertEqual(value, dt.timedelta(days=10))
+
     @with_transaction()
     def test_operator_range_contain(self):
         "Test Range Contain operator"