diff --git a/pyproject.toml b/pyproject.toml
index 2745151..b4db6eb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ readme = "docs/index.md"
 authors = [
   {name = "Ivan Ogasawara", email = "ivan.ogasawara@gmail.com"}
 ]
-license = "Apache Software License 2.0"
+license = "Apache-2.0"
 requires-python = ">=3.10,<4"
 dependencies = [
   "pyyaml >=4",
diff --git a/src/arx/parser.py b/src/arx/parser.py
index 1060322..46bbfbf 100644
--- a/src/arx/parser.py
+++ b/src/arx/parser.py
@@ -682,7 +682,20 @@ def _default_value_for_type(self, data_type: astx.DataType) -> astx.Expr:
             return astx.LiteralString("")
         if isinstance(data_type, astx.NoneType):
             return astx.LiteralNone()
-        return astx.LiteralInt32(0)
+        if isinstance(data_type, astx.DateTime):
+            return astx.LiteralDateTime("1970-01-01T00:00:00")
+        if isinstance(data_type, astx.Timestamp):
+            return astx.LiteralTimestamp("1970-01-01T00:00:00")
+        if isinstance(data_type, astx.Date):
+            return astx.LiteralDate("1970-01-01")
+        if isinstance(data_type, astx.Time):
+            return astx.LiteralTime("00:00:00")
+
+        raise ParserException(
+            f"Parser: No default value defined for type "
+            f"'{type(data_type).__name__}'. "
+            f"An explicit initializer is required."
+        )
 
     def parse_type(self) -> astx.DataType:
         """
diff --git a/tests/test_parser_branches.py b/tests/test_parser_branches.py
index 46a9ceb..e621a1d 100644
--- a/tests/test_parser_branches.py
+++ b/tests/test_parser_branches.py
@@ -205,10 +205,21 @@ def test_parse_type_list_and_default_values() -> None:
         astx.LiteralNone,
     )
     assert isinstance(
-        parser._default_value_for_type(astx.DateTime()),
-        astx.LiteralInt32,
+        parser._default_value_for_type(astx.DateTime()), astx.LiteralDateTime
+    )
+    assert isinstance(
+        parser._default_value_for_type(astx.Timestamp()), astx.LiteralTimestamp
+    )
+    assert isinstance(
+        parser._default_value_for_type(astx.Date()), astx.LiteralDate
+    )
+    assert isinstance(
+        parser._default_value_for_type(astx.Time()), astx.LiteralTime
     )
 
+    with pytest.raises(ParserException):
+        parser._default_value_for_type(astx.ListType([astx.Int32()]))
+
 
 def test_parse_unary_and_prototype_error_paths() -> None:
     """