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 Series 9
Buyer's Guide: Apple Watch (Neutral)

Top Rated Comments

Reason077 Avatar
72 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
72 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
72 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
72 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
72 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
72 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)

Popular Stories

iPhone 16 Camera Lozenge 2 Colors

iPhone 16 Plus Rumored to Come in These 7 Colors

Wednesday April 10, 2024 3:52 am PDT by
Apple's iPhone 16 Plus may come in seven colors that either build upon the existing five colors in the standard iPhone 15 lineup or recast them in a new finish, based on a new rumor out of China. According to the Weibo-based leaker Fixed focus digital, Apple's upcoming larger 6.7-inch iPhone 16 Plus model will come in the following colors, compared to the colors currently available for the...
apple tv 4k yellow bg feature

When to Expect a New Apple TV to Launch

Tuesday April 9, 2024 8:30 am PDT by
It has been nearly a year and a half since the current Apple TV was released, so the device is becoming due for a hardware upgrade. Below, we recap rumors about the next Apple TV, including potential features and launch timing. The current model is the third-generation Apple TV 4K, announced in October 2022. Key new features compared to the previous model from 2021 include a faster A15...
apple silicon feature joeblue

Macs to Get AI-Focused M4 Chips Starting in Late 2024

Thursday April 11, 2024 10:10 am PDT by
Apple will begin updating its Mac lineup with M4 chips in late 2024, according to Bloomberg's Mark Gurman. The M4 chip will be focused on improving performance for artificial intelligence capabilities. Last year, Apple introduced the M3, M3 Pro, and M3 Max chips all at once in October, so it's possible we could see the M4 lineup come during the same time frame. Gurman says that the entire...
iOS 18 WWDC 24 Feature 2

iOS 18 May Feature All-New 'Safari Browsing Assistant'

Wednesday April 10, 2024 6:11 am PDT by
iOS 18 will apparently feature a new Safari browsing assistant, according to backend code on Apple's servers discovered by Nicolás Álvarez. MacRumors contributor Aaron Perris confirmed that the code exists, but not many details are known at this time. Álvarez said it seems like the browsing assistant will use iCloud Private Relay's infrastructure to send relevant data to Apple in a...
maxresdefault

Review: Six Months With the iPhone 15 Pro

Wednesday April 10, 2024 10:53 am PDT by
It's been a bit over six months since the iPhone 15 lineup came out in September, and MacRumors videographer Dan Barbera has been using an iPhone 15 Pro Max sans case since launch. Over on our YouTube channel, Dan did a long term review to demo how his phone has held up and his thoughts on the Action button, battery life, and camera features. Subscribe to the MacRumors YouTube channel for more ...
iOS 18 Siri Integrated Feature

iOS 18 Will Add These New Features to Your iPhone

Friday April 12, 2024 11:11 am PDT by
iOS 18 is expected to be the "biggest" update in the iPhone's history. Below, we recap rumored features and changes for the iPhone. iOS 18 is rumored to include new generative AI features for Siri and many apps, and Apple plans to add RCS support to the Messages app for an improved texting experience between iPhones and Android devices. The update is also expected to introduce a more...