def default(self, obj):
if isinstance(obj, arrow.Arrow):
return obj.for_json()
elif isinstance(obj, datetime.datetime):
return obj.strftime('%Y-%m-%dT%H:%M:%SZ')
elif isinstance(obj, datetime.date):
return obj.strftime('%Y-%m-%d')
# Let the base class default method raise the TypeError
return json.JSONEncoder.default(self, obj)
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