I have written a script that checks the DST start date and records the machine name and DST results in a text file. The script obtains the data by querying the Windows Management Instrumentation (WMI) service, and so it is not dependent on any specific registry setting or the existence of a specific service pack, hotfix, and so on.

There are a few caveats that need to be adhered to for this script to work:

• The script must be activated from an account with appropriate rights to query the remote machine.
• DNS records must be correct for each remote machine.
• The remote machine must be running a Microsoft-based OS (NT4/Windows 2000 and later).

As a result of these caveats, the following server types will need to be checked through some other method:

• Linux/Unix machines
• Non-domain servers (DMZ, for example)
• Any machines that were shut down/powered off at the time the script is run (like virtual machines and so on)

Daylight Day – which occurrence of the “day of week” during the month (5 is always the last occurrence in any month)
Daylight Day of Week – the day of the week on which the change occurs (zero being Sunday)
Daylight Month – which month of the year