[Python] Python RFC 3339 format for JSON serialization

I am trying to generate JSON date string for yesterday. I am not sure how to generate it in RFC 3339 format.

from datetime import date, timedelta
yesterday = date.today() - timedelta(1)


def dthandler(obj):
return obj.isoformat()

with io.open('out/test.json', 'w', encoding='utf-8') as outfile:
json.dump(rdata, outfile, indent=4, sort_keys=True, default=dthandler)


which format the date as:

"Date": "2012-12-04",


How can I write the formatter function to get RfC 3339 format?

I use Python 3.x.

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