Replace integer timestamps with datetime objects

docs/source/conf.py

@@ -18,7 +18,6 @@
 
 import os
 import sys
-from datetime import datetime
 
 sys.path.insert(0, os.path.abspath("../.."))
 
@@ -38,9 +37,14 @@ extensions = [
     "sphinx.ext.autodoc",
     "sphinx.ext.napoleon",
     "sphinx.ext.autosummary",
+    "sphinx.ext.intersphinx",
     "sphinx_copybutton"
 ]
 
+intersphinx_mapping = {
+    "python": ("https://docs.python.org/3", None)
+}
+
 master_doc = "index"
 source_suffix = ".rst"
 autodoc_member_order = "bysource"