[tz] MS-Windows 10 and New Zealand yesterday

[Paul Eggert]

Chris Keall of the National Business Review (New Zealand) reports that 
laptops and phones running Microsoft Windows 10 missed the end of 
daylight saving time in New Zealand yesterday. Microsoft Windows 7 
laptops operated correctly. This leads me to think that the problem has 
something to do with the tz database, as MS-Windows 7 does not use 
tzdata whereas MS-Windows 8.1 and later use tzdata, at least in some 
cases. Does anyone have technical information about why the glitch 
happened? Is there some way we can help avoid it in the future?

Keall C. Living in the past: Windows 10 fails to update for end of 
daylight saving. NBR 2017-04-03. 
https://www.nbr.co.nz/article/living-past-windows-10-fails-update-end-daylight-saving-ck-201449