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You can obtain a string representation of an ISO 8601 date from a DateTime object using the ToString() method with the "s" format specifier. This will return the date and time in the following format: "yyyy-MM-ddTHH:mm:ss" where "T" is the separator between the date and time.
For example:
DateTime now = DateTime.Now;
string isoDate = now.ToString("s");
Console.WriteLine(isoDate);
Output:
2021-07-06T10:46:23
If you want to include the time zone offset, you can use the "o" format specifier instead:
string isoDateWithOffset = now.ToString("o");
Console.WriteLine(isoDateWithOffset);
Output:
2021-07-06T10:46:23.6759678-04:00