On Nov 10, 2015, at 11:49 AM, Matt Johnson (PNP) <matt.johnson@microsoft.com> wrote:
Also keep in mind that a large number of mobile devices (esp. phones) do not actually use the device's location information to set the time zone, but rather use the signals provided by the mobile carrier (such as NITZ). https://en.wikipedia.org/wiki/NITZ
He'd asked about iPads and Macs, both of which definitely *do* use the location information, but, yes, some machines might not do so. (One would hope that devices with 1) the ability to determine the device location, 2) OSes of a sufficient level of sophistication - which includes both UN*Xes and Windows NT derivatives - and 3) enough space to spend some of it on a set of boundaries for the OS's notion of time zones, would use the location information.)