Having a bright, blue wallpaper for day use and a darker, reddish wallpaper for evening/night is useful stay in synch with the real time of day. So, i wanted my windows xp machine automatically switch to the day wallpaper from 7-20 and to night from 20-7 hours. The following batch script does this, without any add-on software. To use, copy-paste the file and store it to your scripts directory (e:\etc in my case).
REM :: chwpdn. batchange to CHange the WallPaper for Day and Night REM :: v1.0 B.Brunner, 23.12.2010 (brb_trash at epr dot ch) REM Prepare two bmp files to be used during day and night REM - jpgs dont work directly, convert to bmp of your screen resolution first! REM - change start and end day hour to your needs REM - store this batchfile in a place like e:\etc REM - make a link to this batchfile in your autostart folder (set minimized in the link) REM - using the task manager have the batchfile start every hour, to switch during the day REM REM Configuration changes go here set wpnight=e:\etc\wallpaper_night.bmp set wpday=e:\etc\wallpaper_day.bmp set daystarthour=7 set dayendhour=20 REM Set hours variable for /f "tokens=1-3 delims=:." %%a in ( "%time%") do set hours=%%a REM Use day wallpaper, except from 00:00-08:00 and 20:00-23:59 set wallpaper=%wpday% if %hours% LSS %daystarthour% goto setnight if %hours% GTR %dayendhour% goto setnight goto setit :setnight set wallpaper=%wpnight% :setit Echo Setting wallpaper to %wallpaper% REG ADD "HKCU\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d %wallpaper% /f RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters