%% You should probably cite rfc9557 instead of this I-D.
@techreport{ietf-sedate-datetime-extended-01,
    number =    {draft-ietf-sedate-datetime-extended-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-sedate-datetime-extended/01/},
    author =    {Ujjwal Sharma and Carsten Bormann},
    title =     {{Date and Time on the Internet: Timestamps with additional information}},
    pagetotal = 11,
    year =      2021,
    month =     oct,
    day =       20,
    abstract =  {This document defines an extension to the timestamp format defined in RFC3339 for representing additional information including a time zone.},
}