Keep a datetime.date in 'yyyy-mm-dd' format when using Flask's jsonify

Question

For some reason, the jsonify function is converting my datetime.date to what appears to be an HTTP date. How can I keep the date in yyyy-mm-d

Answer 1

Following this snippet you can do this:

from flask.json import JSONEncoder
from datetime import date


class CustomJSONEncoder(JSONEncoder):
    def default(self, obj):
        try:
            if isinstance(obj, date):
                return obj.isoformat()
            iterable = iter(obj)
        except TypeError:
            pass
        else:
            return list(iterable)
        return JSONEncoder.default(self, obj)

app = Flask(__name__)
app.json_encoder = CustomJSONEncoder

Route:

import datetime as dt

@app.route('/', methods=['GET'])
def index():
    now = dt.datetime.now()
    return jsonify({'now': now})