allow null datetime

Author: vincentsarago

stac_pydantic/item.py

@@ -20,7 +20,7 @@ class ItemProperties(StacCommonMetadata):
     """
 
     # Overide the datetime field to be required
-    datetime: Optional[UtcDatetime]
+    datetime: Optional[UtcDatetime] = Field(...)
 
     # Check https://docs.pydantic.dev/dev-v2/migration/#changes-to-config for more information.
     model_config = ConfigDict(extra="allow")

tests/example_stac/datetimerange.json

@@ -37,7 +37,7 @@
       ]
     },
     "properties":{
-      "datetime":"2018-01-01T13:21:30Z",
+      "datetime":null,
       "start_datetime":"2018-01-01T13:21:30Z",
       "end_datetime":"2018-01-01T13:31:30Z"
     },