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BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: Doc
Date: November 01, 2010 12:51AM
It's not just Australia.

I have an alarm set to go off every morning at 2am to remind me to hit the gym while it's not busy. (Yes, I really do that.)

It went off at 1am this morning. (EST)

Some Australian bloggers mentioned that their bug only affects repeating alarms so I set a few test alarms to see the extent of the bug.

One-off alarms work normally and repeating alarms do not.

Alarms set to repeat daily at 1:15am, 1:30am, 1:32am and 1:40am did not go off.

Repeating alarms set for 2:18am, 2:25am and 2:42am went off an hour early.

Disabling the General->Date&Time->Set-Automatically preference in the Settings app did not solve the problem. Changing my city in the Time Zone setting from "New York" to "Washington, DC" (both EST cities that are not presently on daylight saving time) did not fix the bug.

Be on the alert that your iPhone alarms may go off an hour early or not at all.

iOS 4.1, build 8b117 (which is the official release despite the "b" in the build number).

...

It's interesting that they set back clocks an hour in England yesterday in their version of Daylight Saving.

...

As I was about to post this, I decided to do one more Google search for the problem, based on my firmware-revision (8b117) and found that there is a new thread on the subject in Apple's forums:
[discussions.apple.com]
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: mlfrank
Date: November 01, 2010 02:48AM
Huh, my touch (gen 4) was okay in getting me up at 1:13am this morning. I still have a palm that did change yesterday for the daylight "savings" change over.......
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: testcase
Date: November 01, 2010 02:54AM
The OLD date to change back to Standard Time was Sunday, 10/31. A change in US law switched it to next Sunday, 11/07 at 0200 hours. My Palm Tungsten T3 switched over as I haven't updated it's software in at least two years now. I'll live with it for one week.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: blooz
Date: November 01, 2010 06:25AM
Why do people use their phones for everything?
Are alarm clocks now passé?

I personally would be leery of having everything in my life depend on one device.



And we should consider every day lost on which we have not danced at least once.
—Friedrich Nietzsche
Western Massachusetts



Edited 1 time(s). Last edit at 11/01/2010 06:25AM by blooz.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: spacescape
Date: November 01, 2010 06:31AM
Our alarm clock was acting up and have been using my iPhone 4 for an alarm clock for almost 3-4 weeks w/o problems. Hmmmmmmm.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: deckeda
Date: November 01, 2010 06:42AM
No problems here from 4.01 nor iOS 4.1, build 8b117. Alarm is set to repeat M-F.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: mattkime
Date: November 01, 2010 07:09AM
>>Are alarm clocks now passé?

unless they have internet access.



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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: Doc
Date: November 01, 2010 07:21AM
Quote
deckeda
No problems here from 4.01 nor iOS 4.1, build 8b117. Alarm is set to repeat M-F.

That's interesting.

Based on that, I set two alarms. One for Mon-Fri and one for every day.

The M-F alarm worked.

The alarm that was set for every day did not work.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: deckeda
Date: November 01, 2010 07:40AM
Cool! You've discovered the workaround. Two alarms to cover all 7 days.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: Doc
Date: November 01, 2010 08:04AM
Quote
deckeda
Cool! You've discovered the workaround. Two alarms to cover all 7 days.

Yes, that seems to work!!
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: DaviDC.
Date: November 01, 2010 08:41AM
The clock by my bed thought Day Light Saving Time ended this past Sunday.



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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: OWC Jamie
Date: November 01, 2010 08:56AM
Son's went off like (bad pun) clockwork at 6 this AM, IOS 4.1, 3G, set to M-F repeating alarm.



Good Luck!
Jamie Dresser
Other World Computing
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: cbelt3
Date: November 01, 2010 10:26AM
Not just the iPhone, but damn near every non-synchronized electronic device... most of the household digital clocks, antiques like my palm pilot, etc...

I find it odd, tho, that the iPhone had that issue. Most cell phones get their time from the service provider.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: Article Accelerator
Date: November 01, 2010 12:02PM
Quote
Doc
I have an alarm set to go off every morning at 2am to remind me to hit the gym while it's not busy. (Yes, I really do that.)

It went off at 1am this morning. (EST)

I like getting up early too.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: neophyte
Date: November 01, 2010 01:17PM
>Most cell phones get their time from the service provider.<

Unless you turn off network access. I still have my Blackberry Storm that I use as my alarm (I like the ringtone). Interestingly, without network access, it gains about a minute every week, so I turn on network access every few weeks to sync with the time server. And recharge it too. Without network access, the battery will last about a month.
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Re: BEWARE: iPhone Alarms Off by One Hour. Do not rely on iPhone alarms!!
Posted by: mrbigstuff
Date: November 01, 2010 01:33PM
the definition of insanity?

try setting a WinMobile device to coincide with EDT/EST twice per year. Hooooooooo-eee! it's enough to make you crazy!



Edited 1 time(s). Last edit at 11/01/2010 01:34PM by mrbigstuff.
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