Customize standard and Daylight Saving Time changes

PI uses an internally constructed table to determine when changes between Standard Time and Daylight Saving Time (DST) occur. By default, PI builds the table using the single time change rule available from Windows. However, when the PI\dat\localhost.tz file is present and valid, PI builds the table using the change rules specified in the file.

If the rules governing DST change in your region, you must update the localhost.tz file. To download an updated localhost.tz file, visit the Customer Portal.

See Create a custom localhost.tz file to learn more.