Daylight Saving Time implementation varies from country to country. Some countries may not observe daylight saving time, whereas other countries may change the start dates and end dates for daylight saving time every year. This can cause administrative confusion with DST updates and possible time issues on machines.
Microsoft strongly recommends that DST and time zone updates be installed on all affected systems, devices and applications to ensure consistency with current DST rules and time zone settings worldwide.
Customers that have machines in regions outside those covered by the DST cumulative update packages can update the time zone by using registry files per
Microsoft KB 914387
In all instances, collecting either
with the General, Internet and Networking, Business Networks and Server Components diagnostics, or a Performance-oriented MSDT manifest must be done. You should also verify that the latest DST cumulative update has been applied. Additional data required may include the following:
Collect the KB95839.log file and the TZLog.log file (this file is located in the %systemroot%\System32 folder)