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Tonight British Summer Time comes to an end with the clocks being moved back by 1 hour at 2am (set again to 1am).
This sort of playing around with times and dates can cause software issues, so I had a look to see how Android alarm (stock Android 9) handles it, specifically after setting an alarm a toast pops up saying something like "Alarm set for 3 hours 15 minutes".
Sure enough, Android was up to scratch and at 10pm setting an alarm for 3am gave me the expected "Alarm set for 6 hours".
However there is a strange hour of real world time that you can't set an alarm for in advance.
E.g. At 01:10 (BST) you cannot set an alarm for 1hr 30m in the future. Normally this would be 02:40, but will have rolled around to 01:40 (GMT). Obviously setting the alarm at 01:40 will result in it going in only 30 minutes (and then an hour later if set to recurring)
A strange quirk of not being able to set the timezone when setting an alarm, and something that will affect very few people, but did cause me a small problem as I've been polyphasic sleeping for a number of years and wanted to set an alarm for 90 minutes.
Thanks to British Summer Time I settled for a 10 min power nap instead.