On 07/09/2015 10:08 AM, Deborah Goldsmith wrote:
Is there an advantage to waiting? Yes. After we make a change, sometimes we find that the supplied information was wrong. Sometimes the authorities change their minds. Sometimes we have the correct information but enter the data incorrectly, and don't discover this until further review. In cases like these, dallying before an official release can save us all some work. This is partly why we delayed from March 10 to March 21 before releasing 2015b as an official fix for Mongolia.
If these delays cause problems for you, it's reasonable to use the unofficial repository at <https://github.com/eggert/tz> as a basis for operating system patches. That is, users of the tz database have a choice of either a bleeding edge unofficial version that is more up-to-date but is also more likely to contain errors, or a more-stable official version that may not have the very latest experimental changes but should work well for those who keep reasonably up-to-date with the official version.