Date Column Update Failing Using change_simple_column_value in / C#

Hi. I’d appreciate any advice on the error response I am receiving from GraphQL. I am trying to update a date column using the mutation “change_simple_column_value”. Here is the error I am getting:

{{  "error_code": "ColumnValueException",  "status_code": 200,  "error_message": "invalid value, please check our API documentation for the correct data structure for this column.",  "error_data": {    "column_value": "{\"date\"=>\"\\\"2019-06-03\", \"time\"=>\"13:25:00\\\"\"}",    "column_type": "DateColumn"  }}}

This is the string I am sending:

string dt = "2019-06-03 13:25:00";
string value = @"\\\""" + dt + @"\\\""";
string query = "{\"query\" : \"mutation { change_simple_column_value(board_id: " + boardId + ", item_id: " + itemId + " , column_id: \\\"" + columnId + "\\\", value: \\\"" + value + "\\\") { id } }\"}";

This works in the “API Playground”. I think that there is an issue with the date format, but nothing I try works. Other column type updates work without issue. Thanks for any help!

Hello there @ianestu and welcome to the community!

I hope you like it here :muscle:

I am not experienced with Python but I created this example from our Postman examples for you (Exporting to Python):

import http.client

import json

conn = http.client.HTTPSConnection("")

payload = json.dumps({

"query": "mutation {change_multiple_column_values(item_id:11111, board_id:22222, column_values: \"{\\\"date\\\" : {\\\"date\\\" : \\\"1993-08-27\\\", \\\"time\\\" : \\\"18:00:00\\\"}}\") {id}}"


headers = {

'Authorization': 'RELEVANT_API_KEY',

'Content-Type': 'application/json'


conn.request("POST", "/v2", payload, headers)

res = conn.getresponse()

data =


What happens if you try something like this?

Looking forward to hearing from you :slightly_smiling_face:


Hi, @Matias.Monday. I am working with C#, not Python. Can you please provide an example that updates a date column value using C#?

It seems to me that the change_simple_column_value endpoint that I describe above is recognizing the column, but not the format. Is there any insight that you can provide on what I am doing wrong there?

Thanks again!

Hello again,

Sorry about that! My bad.

Here is the Postman example exported to C#:

var client = new HttpClient();

var request = new HttpRequestMessage(HttpMethod.Post, "");

request.Headers.Add("Authorization", "RELEVANT_API_KEY");

var content = new StringContent("{\n \"query\": \"mutation {change_multiple_column_values(item_id:11111, board_id:22222, column_values: \\\"{\\\\\\\"date\\\\\\\" : {\\\\\\\"date\\\\\\\" : \\\\\\\"1993-08-27\\\\\\\", \\\\\\\"time\\\\\\\" : \\\\\\\"18:00:00\\\\\\\"}}\\\") {id}}\" \n}", null, "application/json");

request.Content = content;

var response = await client.SendAsync(request);


Console.WriteLine(await response.Content.ReadAsStringAsync());

Looks to me like the issue may be related to how quotes are being escaped.

Please let me know how this goes!


1 Like

Hi, I was able to successfully update a column using “change_multiple_column_values” from the example provided. Thank you @Matias.Monday .


Happy to help @ianestu !!

1 Like