Daylight Savings Editor

This is a Daylight Savings Editor for Mac OS 8.5 to 9.2.2. It edits the 'loc#' resource in the System file which contains all the time zone parameters for various cities around the world. You will need to restart your computer after making changes for those changes to take effect. Make sure the Date & Time control panel is not open when running this.

You use this at your own risk, I accept no responsibility if this application causes any problems. It is a good idea to save a copy of your System file, the Date & Time control panel, and the Date & Time Preferences before making any changes.

Version 1.0d2 does not support internationalized systems where the name of the Date & Time control panel and the Date & Time Preferences are different.

Version 1.0d2 only supports changing the daylight savings parameters for existing cities. It does not yet support adding or removing cities, or changing the time zone if cities.

The format of the 'loc#' resource is an extension of the 'CTY#' resource in earlier systems. The format of 'CTY#' resources is documented here.

Version 1.0d2 fixes a bug where changing the None/Manual/Automatic setting would result in a corrupted city list until it was changed back. It also synchronizes the settings between the System file, the Date & Time control panel, and the Date & Time Preferences.

Click here to download Daylight Savings Editor 1.0d2 (StuffIt archive - 7k)


Last modified 13 March 2007. Copyright 2007 Glenn Anderson.