<para>
This option is used in conjunction with the <option>start</option> option to
discard all trackpoints outside of a given period of time.  This option
defines the end of the time period.
</para>
<para>
If this option is not specified, the time period is assumed to end at the
end of civilization as we know it or the year 2038, whichever comes first.
The time for this option is expressed in UTC.
</para>
<para>
See the <option>start</option> option for the format of this value and an
example of usage.
</para>
