You may not be able to use the major activity complication on Infograph Modular on Apple Watch Series 4 if you live in a country where the bells are about to roll back this weekend. This is because there has not been a software update since the same summertime process has affected users in Australia earlier this month.
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The software bug is simple: The large activity complication on Infograph Modular displays a graph for 24 hours, but some changes in DST result technically in a day of 23 or 25 hours. The complication is not designed to adjust for these changes yet.
Apple will probably release a software update before DST ends in the United States. watchOS 5.1 is currently in beta (and may include the fix) that may be released around the Apple event next week. watchOS 5.0.1 was released September 27th, one and a half hours before the DST error detected. Maybe we will see watchOS 5.0.2 later today, but if not, expect the same DST error present.
DST starts the first Sunday in October in Australia and ends the last Sunday in October across many countries in Europe including England. In the United States, DST will end on the first Sunday of November, which will fall on November 4 this year.
When DST bug hit Apple Watch Series 4 users in Australia earlier this month, the result was consistent to crash and reboot. The problem was solved automatically when the day was changed and the cause corrected itself, and customers who managed to change the complication on the clock could avoid it.
Since there has been no software update released for Apple Watch since the DST error, we have to assume that the same question is going to hit across Europe this weekend too.
The difference this time is that we at least know to expect it. You can simply change your watch or just the big complication on Infograph Modular to avoid the risk of restart and crash when the clock rolls back on Sunday.
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