[boost] [Boost-bugs] [ boost-Support Requests-1471723 ] support new 2007 DST rules for timezone db

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-04-17 09:20:57

Support Requests item #1471723, was opened at 2006-04-17 06:20
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: support new 2007 DST rules for timezone db

Initial Comment:
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.

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