[tz] If you lie about the time zone, your iPhone will have its revenge

Brian Inglis Brian.Inglis at systematicsw.ab.ca
Mon Jan 18 08:07:29 UTC 2016

On 2016-01-18 00:42, Guy Harris wrote:
> On Jan 17, 2016, at 11:14 PM, Paul Eggert wrote:
>> iPhone 6s and iPhone 6s Plus users are reporting that their phones
>> are sometimes showing plenty of charge left even though their
>> batteries are actually depleted, leaving some users stranded out of
>> power. Apparently users who change their time (e.g., to gain unfair
>> advantage in games like Candy Crush Saga) can confuse iOS 9.2 into
>> not updating the battery percentage indicator. A similar problem
>> can occur to users who set the time zone manually. One workaround
>> is to reboot and revert to getting date and time from the network.

> (So what happens if whatever daemon is responsible for monitoring
> your location notices you've crossed a time zone boundary and changes
> the time zone *for* you?  "Set Automatically" enables that.)

It appears that also causes the problem, as would following their
workaround instructions. Apple article at
https://support.apple.com/en-us/HT205727 says:
If your iPhone 6s or iPhone 6s Plus battery percentage doesn't update

If you change the time on your iPhone 6s or iPhone 6s Plus manually or
*change time zones when traveling*, you might notice that the battery
percentage doesn't update.

It recommends: 1. Restart your iPhone; 2. Change settings to Set

These instructions should probably be reversed as it changes the time
zone, which causes the problem!

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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