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4 changes: 2 additions & 2 deletions ipykernel/jsonutil.py
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
import re
import types
from binascii import b2a_base64
from datetime import datetime
from datetime import date, datetime

from jupyter_client._version import version_info as jupyter_client_version

Expand Down Expand Up @@ -155,7 +155,7 @@ def json_clean(obj): # pragma: no cover
for k, v in obj.items():
out[str(k)] = json_clean(v)
return out
if isinstance(obj, datetime):
if isinstance(obj, datetime) or isinstance(obj, date):
return obj.strftime(ISO8601)

# we don't understand it, it's probably an unserializable object
Expand Down
3 changes: 2 additions & 1 deletion ipykernel/tests/test_jsonutil.py
Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
import json
import numbers
from binascii import a2b_base64
from datetime import datetime
from datetime import date, datetime

import pytest
from jupyter_client._version import version_info as jupyter_client_version
Expand Down Expand Up @@ -54,6 +54,7 @@ def test():
((x for x in range(3)), [0, 1, 2]),
(iter([1, 2]), [1, 2]),
(datetime(1991, 7, 3, 12, 00), "1991-07-03T12:00:00.000000"),
(date(1991, 7, 3), "1991-07-03T00:00:00.000000"),
(MyFloat(), 3.14),
(MyInt(), 389),
]
Expand Down