diff --git a/ifex/model/ifex_ast_construction.py b/ifex/model/ifex_ast_construction.py
index 21b06db5..79d9b08b 100644
--- a/ifex/model/ifex_ast_construction.py
+++ b/ifex/model/ifex_ast_construction.py
@@ -44,6 +44,7 @@
 
 from collections import OrderedDict
 from dataclasses import is_dataclass, fields
+from datetime import date, datetime
 from ifex.model import ifex_ast
 from ifex.model.type_checking_constructor_mixin import add_constructor
 
@@ -67,6 +68,8 @@ def is_empty(node) -> bool:
     else:
         return node is None
 
+def is_simple_type(t) -> bool:
+    return t in [str, int, float, bool, date, datetime]
 
 def ifex_ast_to_dict(node, debug_context="") -> OrderedDict:
 
@@ -76,7 +79,7 @@ def ifex_ast_to_dict(node, debug_context="") -> OrderedDict:
         raise TypeError(f"None-value should not be passed to function, {debug_context=}")
 
     # Strings and Ints are directly understood by the YAML output printer so just put them in.
-    if type(node) in [str, int]:
+    if is_simple_type(type(node)):
         return node
 
     # In addition to dicts, we might have python lists, which will be output as lists in YAML
@@ -95,13 +98,13 @@ def ifex_ast_to_dict(node, debug_context="") -> OrderedDict:
     # we skip them.  Note that empty items can happen only on fields that are
     # Optional, otherwise the type-checking constructor would have caught the
     # error.
- 
+
     for f in fields(node):
         item = getattr(node, f.name)
         if not is_empty(item):
             ret[f.name] = ifex_ast_to_dict(item, debug_context=str(f))
 
-    return ret 
+    return ret
 
 
 def ifex_ast_as_yaml(node):
@@ -126,4 +129,3 @@ def ifex_ast_as_yaml(node):
     print(ifex_ast_to_dict(root))
     print("\n--- Test objects as YAML: ---")
     print(ifex_ast_as_yaml(root))
-
diff --git a/ifex/schema/ifex_to_json_schema.py b/ifex/schema/ifex_to_json_schema.py
index 05afee92..c81b6754 100644
--- a/ifex/schema/ifex_to_json_schema.py
+++ b/ifex/schema/ifex_to_json_schema.py
@@ -14,6 +14,10 @@
 """
 
 from dataclasses import fields
+from datetime import datetime, date
+
+from ifex.model.ifex_ast_construction import is_simple_type
+
 from ifex.model.ifex_ast import AST
 from ifex.model.ifex_ast_introspect import actual_type, field_actual_type, field_inner_type, inner_type, is_forwardref, is_list, type_name, field_is_list, field_is_optional, field_referenced_type
 from typing import Any
@@ -29,10 +33,18 @@
 def get_type_name(t):
     if t is Any:
         return "Any"
+    if t is bool:
+        return "boolean"
+    elif t is datetime:
+        return "string"
+    elif t is date:
+        return "string"
     elif t is str:
         return "string"
     elif t is int:
         return "integer"
+    elif t is float:
+        return "number"
     else: # "complex type"
         return type_name(actual_type(t))
 
@@ -109,7 +121,7 @@ def collect_type_info(t, collection={}, seen={}):
 
     # We don't need to gather information about primitive types because they
     # will not have any member fields below them.
-    if t in [str, int, Any]:
+    if is_simple_type(t) or t is Any:
         return
 
     # ForwardRef will fail if we try to recurse over its children.  However,
diff --git a/tests/gen_test.py b/tests/gen_test.py
index 1a574aa6..f7a83cd4 100644
--- a/tests/gen_test.py
+++ b/tests/gen_test.py
@@ -4,10 +4,19 @@
 # Test code for code generator part of IFEX
 # ----------------------------------------------------------------------------
 # This is maybe not ideal way but seems efficient enough
+from dataclasses import dataclass
+from datetime import date, datetime
+from typing import Optional
+
+import yaml
+
 from ifex.model import ifex_ast, ifex_parser, ifex_generator
 import dacite, pytest
 import os
 
+from ifex.model.ifex_ast import Argument, AST, Namespace, Interface, Method
+from ifex.model.ifex_ast_construction import ifex_ast_as_yaml
+
 TestPath = os.path.dirname(os.path.realpath(__file__))
 
 def test_x():
@@ -70,8 +79,54 @@ def test_expected_raised_exceptions():
         with pytest.raises(dacite.UnexpectedDataError) as ee:
             ast_root = ifex_parser.get_ast_from_yaml_file(os.path.join(path, 'input.yaml'))
 
+@dataclass
+class Argument(Argument):
+    name: str
+    simple_type_str: Optional[str] = None
+    simple_type_int: Optional[int] = None
+    simple_type_bool: Optional[bool] = None
+    simple_type_float: Optional[float] = None
+    simple_type_date: Optional[date] = None
+    simple_type_datetime: Optional[datetime] = None
+
+
+def test_simple_types():
+    simple_types = yaml.safe_load(ifex_ast_as_yaml(AST(namespaces=[
+        Namespace(
+            name="namespace1",
+            interface=Interface(
+                name="interface1",
+                methods=[
+                    Method(
+                        name="method1",
+                        input=[
+                            Argument(
+                                name="argument1",
+                                datatype="mixed",
+                                simple_type_str="string",
+                                simple_type_int=123,
+                                simple_type_bool=True,
+                                simple_type_float=123.45,
+                                simple_type_date=date.today(),
+                                simple_type_datetime=datetime.now()
+                            )
+                        ]
+                    )
+                ]
+            )
+        )
+    ])))["namespaces"][0]["interface"]["methods"][0]["input"][0]
+
+    assert type(simple_types["simple_type_str"]) == str
+    assert type(simple_types["simple_type_int"]) == int
+    assert type(simple_types["simple_type_bool"]) == bool
+    assert type(simple_types["simple_type_float"]) == float
+    assert type(simple_types["simple_type_date"]) == date
+    assert type(simple_types["simple_type_datetime"]) == datetime
+
+
 # Unused
 default_templates = {}
 
 # TODO: Loop over subdirectories in tests to perform tests for different
-# 'input.yaml/template/result' files
+# 'input.yaml/template/result' files
\ No newline at end of file