Object of type datetime is not JSON serializable

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how to serializ the date time object in python api
i have a api which will give json output and i am trying to save it as excel using xlsxwriter and i am getting this error

Object of type datetime is not JSON serializable

this is the api output

Quote:
"sub_start_date_end_date": [
{
"column_name": "country",
"column_value": "'USA'",
"display_text": "Country",
"end_date": "Fri, 03 Sep 2021 00:00:00 GMT",
"start_date": "Thu, 03 Sep 2020 00:00:00 GMT"
}
]

What I have tried:

Python

@final.route('/start_date-end_date', methods=['GET'])
def subscription_date():
    subscription_id = request.args.get('subscription_id')
    email = request.args.get('email')
    update_query = '''
            query
            '''
    result = db.session.execute(text(update_query), {'a':email})
    final = [dict(i) for i in result]
    excel = json.dumps(final)
    efile = json.load(excel, indent=4, cls=DateTimeEncoder)
    workbook = xlsxwriter.Workbook('myfile.xlsx')
    worksheet = workbook.add_worksheet()
    row = 0
    col = 0

    for key in efile:
        row += 1
        worksheet.write(row, col, key)
        worksheet.write(row, col + 1, efile[key])
        print(workbook)
        workbook.close()
    return{"sub_start_date_end_date":final}

class DateTimeEncoder(JSONEncoder):
    def default(self, obj):
        if isinstance(obj, (datetime.start_date, datetime.end_date)):
            return obj.isoformat()

Posted 20-Sep-20 21:33pm

Member 13998042

Updated 20-Sep-20 22:43pm

CPallini

v3

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OriginalGriff · Answer 1 · 2020-09-20T22:36:00

Solution 1

Have a look here: Python Serialize Datetime into JSON[^]

Posted 20-Sep-20 22:36pm

OriginalGriff

Sandeep Mewara · Answer 2 · 2020-09-20T22:43:00

Generally, using of json.dumps with a custom converter.

Quote[^]:
The json.dumps method can accept an optional parameter called default which is expected to be a function. Every time JSON tries to convert a value it does not know how to convert it will call the function we passed to it. The function will receive the object in question, and it is expected to return the JSON representation of the object

Example:

Python

import json
import datetime
 
d = {
   'name' : 'Foo'
}
print(json.dumps(d))   # {"name": "Foo"}
 
d['date'] = datetime.datetime.now()
 
def myconverter(o):
    if isinstance(o, datetime.datetime):
        return o.__str__()
 
print(json.dumps(d, default = myconverter))    # {"date": "2016-04-08 11:43:36.309721", "name": "Foo"}

In your case, you can try a quick way like:

Python

excel = json.dumps(final, default=str)

By default, it converts everything it doesn't know to a string.

More reference to look: Python Serialize Datetime into JSON[^]