http://mw.lojban.org/index.php?title=loi_lerfu_tcita_detri
Made some additions:
{zy} as abbreviation for {jydy} (derived from {ze});
{xy} for century (derived from {xecto});
Tags for 12-hour times; I strongly prefer 24-hour, but they're there just in case one needs to refer to a 12-hour time without knowing whether it's am or pm;
Ways to turn dates into sumti for time-sumtcita and such.