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so the date is normalized to 2001-05-01.  ^A similar effect occurs when
the original date is February 29 of a leapyear and the modifier is
&plusmn;N years where N is not a multiple of four.</p>

<p>^The "start of" modifiers (7 through 9) shift the date backwards 
to the beginning of the current month, year or day.</p>

<p>^The "weekday" modifier advances the date forward to the next date 
where the weekday number is N. Sunday is 0, Monday is 1, and so forth.</p>
<p>^The "weekday" modifier advances the date forward, if necessary,
to the next date where the weekday number is N. Sunday is 0, Monday is 1,
and so forth.
^If the date is already on the desired weekday, the "weekday" modifier
leaves the date unchanged.  </p>

<p>^The "unixepoch" modifier (11) only works if it immediately follows 
a timestring in the DDDDDDDDDD format. 
^This modifier causes the DDDDDDDDDD to be interpreted not 
as a Julian day number as it normally would be, but as
[http://en.wikipedia.org/wiki/Unix_time | Unix Time] - the 
number of seconds since 1970.  If the "unixepoch" modifier does not