JSI Tip 7385. How do I display or set when Daylight Saving Time begins and ends information using the command-line?

The Resource Kits contain Timezone.exe, the Daylight Saving Time Update Utility. You can also download Timezone.exe.

When you type timezone /?, you receive:

Daylight Saving Time Update Utility
Copyright Microsoft Corporation 1997. All rights reserved

TIMEZONE \[/?\] \[/g | /s StartDate EndDate\]

  /?: Command line help
  /g: Get the current timezone
  /s: Set a new timezone
  StartDate: Date that Daylight Saving Time begins
  EndDate: Date that Daylight Saving Time ends

  StartDate and EndDate use format:  Hour:DayOfWeek:Day:Month
    Hour: 00-23 (specifies the hour)
    DayOfWeek: 0-6 (specifies the day of the week; Sunday = 0, Monday = 1,
                    and so on)
    Day : 1-5 (specifies the occurrence of day in the month; 1 = first
               occurrence of day, 2 = second occurrence of day, ..., 5 = last
               occurrence of day)
               (if DayOfWeek is Sunday, then 1 = first Sunday, 4 = fourth
               Sunday, 5 = last Sunday)
    Month: 01-12 (specifies the month; January = 1, February = 2, and so on)

Example:

  TIMEZONE /s 02:0:5:04 02:2:1:10

    Timezone will be changed to:
    Daylight Saving Time begins at 2:00 on last Sunday in April (02:0:5:04)
    Daylight Saving Time ends at 2:00 on forth Tuesday in October (02:2:4:10)

When you type timezone /g, you receive a display similar to:

Current Timezone is :

  Daylight Saving Time begins at 02:0:1:04
  Daylight Saving Time ends at 02:0:5:10

If you wanted to parse this information in a batch script, you could:

for /f "Skip=1 Tokens=4,6-9 Delims=: " %%s in ('timezone /g') do if /i "%%s" EQU "begins" (
   set shr=%%t&set sdow=%%u&set sday=%%v&set smon=%%w 
 ) ELSE (
   set ehr=%%t&set edow=%%u&set eday=%%v&set emon=%%w
 )

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