be more permissive about date format

CHANGELOG.txt

@@ -2,6 +2,7 @@
 - Fix validator for Item `datetime` and Common MetaData `start_datetime` and `end_datetime`
 - Make sure all `datetime` fields are correctly parsed
 - Include `datetime` and `license` to Common MetaData
+- Be more permissive about date format
 - Make sure default values for required but unset fields are correctly parsed
 - Add support from Python 3.12
 - Lint all files

pyproject.toml

@@ -23,7 +23,8 @@ dependencies = [
         "click>=8.1.7",
         "pydantic>=2.4.1",
         "geojson-pydantic>=1.0.0",
-        "ciso8601~=2.3"]
+        "ciso8601~=2.3",
+        "python-dateutil>=2.7.0"]
 dynamic = ["version", "readme"]
 
 [project.scripts]

stac_pydantic/shared.py

@@ -3,7 +3,7 @@
 from typing import Any, Dict, List, Optional, Tuple, Union
 from warnings import warn
 
-from ciso8601 import parse_rfc3339
+import dateutil.parser
 from pydantic import BaseModel, ConfigDict, Field, field_serializer, model_validator
 
 from stac_pydantic.utils import AutoValueEnum
@@ -151,19 +151,19 @@ def validate_start_end_datetime(cls, data: Any) -> Any:
                 )
 
             if isinstance(datetime, str):
-                data["datetime"] = parse_rfc3339(datetime)
+                data["datetime"] = dateutil.parser.isoparse(datetime)
 
             if isinstance(start_datetime, str):
-                data["start_datetime"] = parse_rfc3339(start_datetime)
+                data["start_datetime"] = dateutil.parser.isoparse(start_datetime)
 
             if isinstance(end_datetime, str):
-                data["end_datetime"] = parse_rfc3339(end_datetime)
+                data["end_datetime"] = dateutil.parser.isoparse(end_datetime)
 
             if isinstance(created, str):
-                data["created"] = parse_rfc3339(created)
+                data["created"] = dateutil.parser.isoparse(created)
 
             if isinstance(updated, str):
-                data["updated"] = parse_rfc3339(updated)
+                data["updated"] = dateutil.parser.isoparse(updated)
 
         return data
 

tests/test_item.py

@@ -56,6 +56,27 @@ def test_item_datetime_set_null():
     assert item_json["properties"]["end_datetime"] == "2022-12-01T00:00:00Z"
 
 
+@pytest.mark.parametrize(
+    "datetime", ["2022-01-01T00:00:00", "2022-01-01", "2022-01", "2022"]
+)
+def test_item_datetime_no_z(datetime):
+
+    item_data = {
+        "type": "Feature",
+        "id": "sample-item",
+        "stac_version": "1.0.0",
+        "geometry": {"type": "Point", "coordinates": [125.6, 10.1]},
+        "bbox": [125.6, 10.1, 125.6, 10.1],
+        "properties": {"datetime": datetime},
+    }
+    item = Item(**item_data)
+
+    item_json = item.model_dump(mode="json")
+
+    # The model should fix the date and timezone for us
+    assert item_json["properties"]["datetime"] == "2022-01-01T00:00:00Z"
+
+
 def test_item_bbox_missing():
 
     item_data = {