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 Also, for older versions of Mac OS X no longer updated by Apple may need fresh time zone data.


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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