Some Apple Watch Series 4 Models Caught in Reboot Loop Due to Daylight Saving Time Bug

Some Apple Watch Series 4 owners in Australia experienced crashes and reboots on Saturday due to a bug that surfaced because of the daylight saving time change (via 9to5Mac).

applewatchseries4aluminummodels
According to Reddit users hit by the Apple Watch bug, the root of the problem appears to be the Infograph Modular face's Activity complication, which displays a timeline graph with hourly data for the user's Move calories, Exercise minutes, and Stand hours.

When daylight saving time (DST) lops an hour off the typical 24-hour day, the Activity complication is apparently unable to compute the change and draw the timeline graph with only 23 hours, which throws the Apple Watch into an endless reboot loop until the battery runs out.

According to reports, the bug corrected itself when the date rolled over the next day and the normal 24-hour day was reinstated, but some users were able to restore normal function to their watch before then by removing the Infograph Modular watch face via the iOS Watch app.

This isn't the first time Apple has been caught out by daylight saving time changes, but the company has a few weeks yet to fix this latest DST bug before it happens again when Europe and the U.S. change their clocks on October 28 and November 4, respectively.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

Apple Wallet ID Illinois

Apple Plans to Expand iPhone Driver's Licenses to These 7 U.S. States

Wednesday December 24, 2025 8:40 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Apple Wallet app on the iPhone and Apple Watch, and then use it to display proof of identity or age at select airports and businesses, and in select apps. The feature is currently available in 13 U.S. states and Puerto Rico, and it is expected to launch in at least seven more in the future. To set up the...
iPhone Top Left Hole Punch Face ID Feature Purple

iPhone 18 Pro Launching Next Year With These 12 New Features

Tuesday December 23, 2025 8:36 am PST by
While the iPhone 18 Pro and iPhone 18 Pro Max are not expected to launch for another nine months, there are already plenty of rumors about the devices. Below, we have recapped 12 features rumored for the iPhone 18 Pro models. The same overall design is expected, with 6.3-inch and 6.9-inch display sizes, and a "plateau" housing three rear cameras Under-screen Face ID Front camera in...
maxresdefault

Where's the New Apple TV?

Monday December 22, 2025 11:30 am PST by
Apple hasn't updated the Apple TV 4K since 2022, and 2025 was supposed to be the year that we got a refresh. There were rumors suggesting Apple would release the new Apple TV before the end of 2025, but it looks like that's not going to happen now. Subscribe to the MacRumors YouTube channel for more videos. Bloomberg's Mark Gurman said several times across 2024 and 2025 that Apple would...
maxresdefault

10 Mac Apps Worth Trying in 2026

Wednesday December 24, 2025 9:27 am PST by
2026 is almost upon us, and a new year is a good time to try out some new apps. We've rounded up 10 excellent Mac apps that are worth checking out. Subscribe to the MacRumors YouTube channel for more videos. Alt-Tab (Free) - Alt-Tab brings a Windows-style alt + tab thumbnail preview option to the Mac. You can see a full window preview of open apps and app windows. One Thing (Free) -...
iOS 26

iOS 26.2 Adds These 8 New Features to Your iPhone

Monday December 22, 2025 8:47 am PST by
Earlier this month, Apple released iOS 26.2, following more than a month of beta testing. It is a big update, with many new features and changes for iPhones. iOS 26.2 adds a Liquid Glass slider for the Lock Screen's clock, offline lyrics in Apple Music, and more. Below, we have highlighted a total of eight new features. Liquid Glass Slider on Lock Screen A new slider in the Lock...
airpods color prototypes

Apple Tested AirPods in Bright Colors

Saturday December 27, 2025 6:06 am PST by
Apple reportedly tested a version of the first-generation AirPods with bright, iPhone 5c-like colored charging cases. The images, shared by the Apple leaker and prototype collector known as "Kosutami," claim to show first-generation AirPods prototypes with pink and yellow exterior casings. The interior of the charging case and the earbuds themselves remain white. They seem close to some...
iPhone Fold Vertical Feature

Why Apple's Foldable iPhone May Be Smaller Than Expected

Tuesday December 23, 2025 5:21 am PST by
Apple's first foldable iPhone, rumored for release next year, may turn out to be smaller than most people imagine, if a recent report is anything to go by. According to The Information, the outer display on the book-style device will measure just 5.3 inches – that's smaller than the 5.4-inch screen on the ‌iPhone‌ mini, a line Apple discontinued in 2022 due to poor sales. The report has led ...
Foldable iPhone 2023 Feature Iridescent Search

Samsung Developing 'Wide Fold' With iPhone Fold-Like Design Ahead of Apple's 2026 Launch

Tuesday December 23, 2025 11:55 am PST by
Samsung is working on a new foldable smartphone that's wider and shorter than the models that it's released before, according to Korean news site ETNews. The "Wide Fold" will compete with Apple's iPhone Fold that's set to launch in September 2026. Samsung's existing Galaxy Z Fold7 display is 6.5 inches when closed, and 8 inches when open, with a 21:9 aspect ratio when folded and a 20:18...
iPhone SE Cosmopolitan Clean

Apple Discontinued These 25 Products This Year

Wednesday December 24, 2025 7:24 am PST by
With the end of 2025 near, the time has come to look back at the devices and accessories that Apple discontinued throughout the year. Most of the products that were discontinued this year were simply replaced by a new model with an updated chip. However, the iPhone SE line was entirely discontinued when the iPhone 16e launched, and the iPhone Plus line is being phased out. Below, we have...

Top Rated Comments

Reason077 Avatar
94 months ago
Seems a little ironic that a Watch, of all things, can’t handle the DST change correctly.
Score: 23 Votes (Like | Disagree)
coolfactor Avatar
94 months ago
Seems a little ironic that a Watch, of all things, can’t handle the DST change correctly.
Dealing with timezones and human-made exceptions to normal time cycles, such as Daylight Savings Time, is complex stuff! Even harder to test! I give Apple full credits for doing their best with this. But I am surprised it hasn't been fixed in some low-level library shared across all of their platforms.
Score: 6 Votes (Like | Disagree)
chrono1081 Avatar
94 months ago
Dealing with timezones and human-made exceptions to normal time cycles, such as Daylight Savings Time, is complex stuff! Even harder to test! I give Apple full credits for doing their best with this.
Bingo. People have no clue how complex date and time programming is. I dread every time I have to do it.
Score: 4 Votes (Like | Disagree)
allenvanhellen Avatar
94 months ago
I’m getting tired of Apple rushing stuff and leaving things undone. They may be small issues, but they’re growing in number.
Score: 3 Votes (Like | Disagree)
newellj Avatar
94 months ago
Correction: the changeover happens on early Sunday morning, not Saturday, but this is still Saturday in the US, ‘cause we live in the future!

Don’t you love time zones?
Totally, even within a time zone, going to the other side, or other end, of the time zone can be interesting. Changing days is arbitrary and a little bit of a mind-bender. Needless to say, those of us in NA appreciate those of you Antipodes serving as beta testers. :eek: :D. (meant in good will and good humor)
Score: 2 Votes (Like | Disagree)
Nozuka Avatar
94 months ago
I don't see a problem that they forgot about the time change on the complication. Can happen to the best of us.

But i'm a bit disappointed, that this complication bug reboots the whole watch. it should just kill the complication.
Score: 2 Votes (Like | Disagree)