%% You should probably cite draft-ietf-sedate-datetime-extended instead of this I-D.
@techreport{ryzokuken-datetime-extended-02,
    number =    {draft-ryzokuken-datetime-extended-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ryzokuken-datetime-extended/02/},
    author =    {Ujjwal Sharma},
    title =     {{Date and Time on the Internet: Timestamps with additional information}},
    pagetotal = 9,
    year =      2021,
    month =     jun,
    day =       18,
    abstract =  {This document defines an extension to the timestamp format defined in {[}RFC3339{]} for representing additional information including a time zone.},
}