Is there a way to manually update the time zone definitions (“tz” database formerly known as the “Olson database“)?

For example, the Java platform provides the TZUpdater tool to install, and even build, a fresh copy of the tz data.

Is there some such tool or workaround for Mac OS X?

I know Apple tends to include updates to the tz database as a part of the regular system updates. But sometimes last minute changes are made to take effect sooner than Apple may release a system update. Also, for older versions of Mac OS X no longer updated by Apple may need fresh time zone data.

1 Answer 1


The FreeBSD location is


and the files are there on MacOSX 10.10.5. I'm not sure if updates to those files will be respected by OSX but it's a good place to start.

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