Format timestamps

[KoMa1978]

Can you please add an option "timeRFC3339" similar to "noStringify".

If this option is used, the time values in "lc" and "ts" should not be reported in Unix timestamp but in RFC3339 format (2022-04-06T13:57:38.0753266+02:00).

Links:
https://www.rfc-editor.org/rfc/rfc3339
https://en.wikipedia.org/wiki/ISO_8601
https://ijmacd.github.io/rfc3339-iso8601/

[SirFlour]

that would be very helpful. :)