%% You should probably cite draft-ietf-sedate-datetime-extended instead of this I-D.
@techreport{ryzokuken-datetime-extended-01,
    number =    {draft-ryzokuken-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-ryzokuken-datetime-extended/01/},
    author =    {Ujjwal Sharma},
    title =     {{Date and Time on the Internet: Timestamps with additional information}},
    pagetotal = 19,
    year =      2021,
    month =     jan,
    day =       22,
    abstract =  {This document defines a date and time format for use in Internet protocols for representation of dates and times using the proleptic Gregorian calendar, with optional extensions representing additional information including a time zone.},
}