Represent the datetime objects as UTC in RFC3339 format

INSTALL.md

@@ -41,7 +41,7 @@ conda create -n optimade python=3.7
 conda activate optimade
 
 # Install package and dependencies in editable mode (including "dev" requirements).
-pip install -e .[dev]
+pip install -e ".[dev]"
 
 # Run the tests with pytest
 py.test

optimade/models/jsonapi.py

@@ -1,6 +1,7 @@
 """This module should reproduce JSON API v1.0 https://jsonapi.org/format/1.0/"""
 # pylint: disable=no-self-argument
 from typing import Optional, Union, List
+from datetime import datetime, timezone
 from pydantic import (  # pylint: disable=no-name-in-module
     BaseModel,
     AnyUrl,
@@ -286,3 +287,10 @@ def either_data_meta_or_errors_must_be_set(cls, values):
                 f"At least one of {required_fields} MUST be specified in the top-level response"
             )
         return values
+
+    class Config:
+        json_encoders = {
+            datetime: lambda v: v.astimezone(timezone.utc).strftime(
+                "%Y-%m-%dT%H:%M:%SZ"
+            ),
+        }

optimade/server/routers/utils.py

@@ -56,7 +56,7 @@ def meta_values(
     return ResponseMeta(
         query=ResponseMetaQuery(representation=f"{url_path}?{parse_result.query}"),
         api_version=f"v{__api_version__}",
-        time_stamp=datetime.utcnow(),
+        time_stamp=datetime.now(),
         data_returned=data_returned,
         more_data_available=more_data_available,
         provider=CONFIG.provider,