Using REG.EXE, built into Windows XP, Windows Server 2003, and later operating systems, or installed from the Windows 2000 Support Tools, I have scripted sGMT.bat to schedule a task based upon GMT (Greenwich Mean Time), regardless of the Time Zone.

The syntax for using sGMT.bat is:

Call sGMT \\Computer GMT_Hour2Schedule GMT_Minute2Schedule FQFN


\\Computer          is the computer that the task is scheduled to run on.                              GMT_Hour2Schedule   is GMT hour the job should be scheduled to run.                              GMT_Minute2Schedule is the GMT minute of GMT_Hour2Schedule the job should be scheduled to run.                              FQFN                is the Fully Qualified File Name of the job or command.


If you want c:\util\job.bat to run on \\Server1 at 0:30 GMT:

call sGMT \\Server1 0 30 c:\util\job.bat

If \\Server1 is in the US Eastern Standard Time zone and daylight savings is enabled, then the job would be scheduled to run at 04:30.

sGMT.bat contains:

                               @echo off                              if \{%4\}==\{\} @echo Syntax: Call sGMT \\Computer GMT_Hour2Schedule GMT_Minute2Schedule FQFN&goto :EOF                              setlocal                              set key=%1\HKLM\System\CurrentControlSet\Control\TimeZoneInformation                              for /f "Tokens=3" %%a in ('reg query %key% /V ActiveTimeBias^|FIND "REG_DWORD"') do (                                  set /a off=%%a                              )                              if %off% GEQ 0 goto pos                              set /a off=0 - %off%                              set /a oh=%off% / 60                              set /a om=%off% - (%oh% * 60)                              set /a oh=24 - %oh%                              set /a sh=%2 + %oh%                              set /a sm=%3 + %om%                              if %om% NEQ 0 set /a sh=%sh% - 1                              goto :OK                              :pos                              set /a oh=%off% / 60                              set /a om=%off% - (%oh% * 60)                              set /a sh=%2 + %oh%                              set /a sm=%3 + %om%                              :OK                              if %sm% LSS 10 set sm=0%sm%                              AT %1 %sh%:%sm% %4