*daylight-saving-time-observed*

As of a patch released for version 8.0 in February, 2007, this variable is no longer used. Instead, Daylight Saving Time information is taken from the operating system. The value of this variable is ignored.

However, some operating systems have not been updated to reflect the new United States DST schedules which go into effect in 2007 (with DST starting on March 11, 2007). Allegro CL schedules have been updated. You can use the old system with the updated schedules if you set the unexported variable excl::*use-us-daylight-saving-time* to true. Then this *daylight-saving-time-observed* variable will have effect. But when your OS is updated to have correct DST information, you should use that.

When this variable was used (and when excl::*use-us-daylight-saving-time* is set to true, then this variable worked/works this way: if true, time functions such as cl:decode-universal-time will use United States daylight savings time schedules when calculating dates and times of day. If nil, standard time will be used in such calculations. Note that only United States schedules are supported.

Copyright (c) 1998-2008, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 8.0. This page was not revised from the 7.0 page.
Created 2005.12.9.