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It seems the latest time zone is UTC-12, as listed on the Wikipedia UTC time offsets article. But on the iPhone / iPad, I cannot find and choose the time zone of either "Baker Island" or "Howland Island". How could it be done?

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    Since UTC-12 has no inhabitants at all and is only used by ships, it’s quite likely that Apple didn’t bother to implement it as an option. – Mike Scott Aug 22 '18 at 12:03
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    people on ships need love too ;) – nonopolarity Aug 22 '18 at 12:05
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It doesn't seem to be possible to set UTC-12 in the Date & Time section in Preferences (see below for more on that).

But I was able to spoof my location with Xcode and a GPS file with these contents:

<gpx>
    <wpt lat="0.194722" lon="-176.479444"></wpt>
</gpx>

as explained in Using Xcode to Test Location Services. The Simulator app thought I was on Baker Island (this is a screenshot of the Maps app showing my current location):

enter image description here

This suggests that you could, with the help of a Mac running Xcode, set your iPhone's time zone to UTC-12. I couldn't test it because I don't have a developer account, and one is needed to sign and run apps on an iPhone.

As for the usual method of setting the time with the Date & Time section in Preferences: as I said above that doesn't seem to be possible.

According the Apple support article Get help with the date and time on your iPhone, iPad, and iPod touch, to manually set the time zone you have to "tap Time Zone and enter a city with the time zone that you need".

But Wikipedia's UTC-12 article tells us that UTC−12 is a nautical time zone and although a number of inhabited islands lie within the longitudinal limits of this time zone, none of them keeps the date and time of UTC−12.

So there are no cities to choose, and none of these names (from obvious to obscure) are recognized:

  • Baker Island
  • Howland Island
  • UTC-12
  • US Minor Outlying Islands
  • Anywhere on Earth
  • AoE
  • International Date Line West time zone
  • IDLW

I wonder if turning on "Set Automatically" would properly adjust the time for someone visiting Baker Island...

| improve this answer | |
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    Does Baker Island have a cell site? – Tyson Aug 22 '18 at 15:26
  • I believe XCode has the ability to simulate the device being in a certain GPS location which I haven't done before, but so it probably is possible to test the "Set Automatically" as if you are at that location – nonopolarity Aug 22 '18 at 20:03
  • @太極者無極而生 Tried that, unfortunately, the Date & Time section is not available in the Simulator app, sigh... – jaume Aug 24 '18 at 7:52
  • @jaume what about connecting to a real iPhone? I heard people can connect an iPhone to a Mac with XCode and then change the GPS on the Mac and make the iPhone believe it is at that location – nonopolarity Aug 24 '18 at 13:05
  • @太極者無極而生 I don't have a developer account so I can't test it with an iPhone, but I was able to change the location in the Simulator app so that Maps displayed my position as being in Baker Island. – jaume Aug 25 '18 at 14:29

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