GMT.cmd

Returns the current time into the variable %_gmt% adjusted to Greenwich Mean Time, this can be useful when comparing events across multiple time zones or whenever you don’t want daylight savings to affect the result.

  ::gmt.cmd  Display the current time in GMT (World Time)

  @echo off
  Setlocal
  Set _key=HKLM\System\CurrentControlSet\Control\TimeZoneInformation
  :: find offset from GMT in minutes
  For /f "Tokens=3" %%G in ('Reg query %_key% /V ActiveTimeBias^|FIND "REG_DWORD"') do (
    Set /a _offset=%%G
  )

  :: Convert to hours
  Set /a _offset_hours=%_offset% / 60

  :: Get current local time
  For /f "tokens=1-3 delims=1234567890 " %%a in ("%time%") Do set "delims=%%a%%b%%c"
  For /f "tokens=1-4 delims=%delims%" %%G in ("%time%") Do (
    Set _hh=%%G
    Set _min=%%H
  )
  :: Strip any leading spaces
  Set _hh=%_hh: =%

  :: Ensure the hours have a leading zero
  if 1%_hh% LSS 20 set _hh=0%_hh%

  Echo   Local time: %_hh%:%_min%

  :: add offset to the current time
  Set /a _hh=%_hh% + %_offset_hours%

  :: display result
  Echo   GMT time:   %_hh%:%_min%
  ENDLOCAL&Set _gmt=%_hh%:%_min%

“Time is like money, the less we have of it to spare, the further we make it go” ~ Josh Billings

Related

datetime.vbs - Get Date, Time and daylight savings (VB Script)
GetTime.cmd - Get the time now
TIME - Set the time (list of default time formats for different countries)
Rob Vanderwoude - date/time scripts