Q. How can I schedule a job to run locally or remotely at a specified GMT time, regardless of Time Zone?

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

Where:

\\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.

Examples:

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

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