Add new DateTime format - yyyy-MM-dd'T'HH:mm:ss.ffffffK

[ltouro]

Fix #421

See "O" or "o" in https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-date-and-time-format-strings

[cla-checker-service[bot]]

💚 CLA has been signed

[ltouro]

❌ Author of the following commits did not sign a Contributor Agreement: 2931ee9

Please, read and sign the above mentioned agreement if you want to contribute to this project

Contributor Agreement signed

[Mpdreamz]

Thanks for catching this @ltouro! will try and get this released next week.

[Mpdreamz]

run docs-build