No news from DOT this morning. With Paul Eggert's technique in mind, below find a revised patch to the zic manual page. Barring new developments, on Monday I'll incorporate the manual changes and Paul's previously circulated data changes into the ftp version. --ado ------- zic.8 ------- *** /tmp/geta14571 Thu Jan 26 09:15:18 2006 --- /tmp/getb14571 Thu Jan 26 09:15:18 2006 *************** *** 411,424 **** .q Rolling if the leap second time given by the other fields should be interpreted as local wall clock time. ! .SH NOTE For areas with more than two types of local time, you may need to use local standard time in the .B AT field of the earliest transition time's rule to ensure that the earliest transition time recorded in the compiled file is correct. .SH FILE /usr/local/etc/zoneinfo standard directory used for created files .SH "SEE ALSO" newctime(3), tzfile(5), zdump(8) ! .\" @(#)zic.8 7.22 --- 411,436 ---- .q Rolling if the leap second time given by the other fields should be interpreted as local wall clock time. ! .SH NOTES For areas with more than two types of local time, you may need to use local standard time in the .B AT field of the earliest transition time's rule to ensure that the earliest transition time recorded in the compiled file is correct. + .PP + If, + for a particular zone, + a clock advance caused by the start of daylight saving + coincides with and is equal to + a clock retreat caused by a change in UTC offset, + .IR zic + produces a single transition to daylight saving at the new UTC offset + (without any change in wall clock time). + To get separate transitions + use multiple zone continuation lines + specifying transition instants using universal time. .SH FILE /usr/local/etc/zoneinfo standard directory used for created files .SH "SEE ALSO" newctime(3), tzfile(5), zdump(8) ! .\" @(#)zic.8 7.24