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<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'>The
file America/Godthab, for whatever reason, does not have a POSIX rule string at
the end of it. It does have 859 transition times, so far future dates
rely on the cyclic behavior of the calendar. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'>However,
upon loading, the code does not set the ‘goforward’ flag. So,
in the future (around the year 2409) it does not cycle but uses the last setting
indefinitely (WGT) and stops going into daylight savings time (WGST).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'>It
was *<b>supposed</b>* to set ‘goforward’. But, it did not
work. The last entry in ats is 13847763624. So, differ_by_repeat
will look for an entry of 1224982824. What is actually in the file is an entry
of 1224982823, which is one second too soon to be what is being sought. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'>It
broke because differ_by_repeat does not consider leap seconds. The
addition of a leap second at the end of 2008 broke it. In order to work
properly, zic needs to generate 400 years of table after the last leap second
that it used.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'>(But,
why didn’t it just generate a POSIX rule string like most of the files?)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'>It
looks like America/Santiago has the same problem. This might affect all
the files that are overly large, and perhaps the lack of POSIX string (and
large number of transition times instead) is related to the same issue.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'>--John<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:windowtext'><o:p> </o:p></span></p>
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