id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
605	Support different DST rules in timezone db based on years	nobody	az_sw_dude	"{{{
The boost time library supports processing of the
timezone database file as a .csv, with one entry per
time zone, such as ""America/New_York"".  However, in
2007, the daylight savings time rules will change.  The
contents of the csv need to change, to incorporate a
range of effective years.  Since DST is a spring and
fall event (in both north and south hemispheres) only a
year need be recorded.

I suggest adding two values at the beginning of the
line, (as one field in the form nnnn-nnnn) for the low
effective-year and high effective-year, as 4-digit
values.  Let 0000 be used for ""all previous years"" and
9999 be used for all subsequent years.  [If the '-'
separator is a problem, ':' could be used instead.]

Then, the change in 2007 can be recorded as two lines:
""2007-9999"",""America/New_York"", ...
""0000-2006"",""America/New_York"", ...

Lines unaffected by the change would have ""0000-9999""
as the first field.

}}}"	Feature Requests	assigned		date_time	None	Problem	None