My concern about these changes is that I seem to remember that some first nations in those areas did not use daylight-savings time on their reserves, and that they were real but very small 'zones', not the large zones they ended up being assumed to be. Unfortunately I have no documentation either way on this. ----- Original Message ----- From: Paul Eggert via tz [mailto:tz@iana.org] To: "Chris Walton" <crj.walton@gmail.com> Cc: tz@iana.org Sent: Sat, 15 Oct 2022 12:53:28 -0700 Subject: Re: [tz] Northern Ontario (Canada) Thank you for doing that investigative work. Proposed patch attached and installed into the tzdb development repository on GitHub. This patch follows your suggestions, except that it moves Nipigon's and Rainy River's dubious data to 'backzone' instead of removing them entirely, as I worry that some users will want the appearance of completeness no matter how illusory.