What type of data to pass in custom_fields ( date, url )?

Question

API

I pass data type DateTime (variable DateTime.Now) to custom_fields_values, the server returns 400. What's the problem? Date format, if I'm not mistaken, yy/mm/dd hh:mm:ss
url is the same, but it doesn't give 400: it's just that the data on the server is not updated. I am passing string.

Answer 1

As a result, took long.

long unixSeconds = DateTimeOffset.Now.ToUnixTimeSeconds();