{* *! version 1.0.0  12may2011}{...}
    {cmd:hofd(}{it:e_d}{cmd:)}
{p2colset 8 22 26 2}{...}
{p2col: Domain {it:e_d}:}{cmd:%td} dates 01jan0100 to 31dec9999
           (integers -679,350 to 2,936,549){p_end}
{p2col: Range:}{cmd:%th} dates 0100h1 to 9999h2 (integers -3,720 to 16,079)
           {p_end}
{p2col: Description:}returns the {it:e_h} half-yearly date (half years since
           1960h1) containing date {it:e_d}.{p_end}
{p2colreset}{...}
