The change from GMT to BST (British Summer Time) that will take place over the weekend will lead to lighter evenings in the UK, but it could potentially have some less desirable side effects.
Apple iPhone owners would be well advised not to rely on the device's alarm clock if they have any critical appointments on Sunday morning, given recent events.
Earlier this month, iPhone owners in the US fell victim to the iPhone clock bug, with iPhone clocks going back by one hour, rather than going forward by one hour as they should have done for Daylight Savings Time.
Over the New Year iPhone owners reported problems with one-off alarms in the first few days of January.
Any problem with the iPhone's alarm could prove especially annoying for motorsport fans as the season's opening Formula One race at Albert Park in Melbourne will begin at 0700BST.
Coverage on the BBC will begin at 0600BST, and if you're in the UK you can watch the race live online on the BBC's website.
See also: Apple iPhone 4 review
Comments
mark delreux said: since last weekend 2603 move to summer time every midnight my iPhone 4G clock goes back by 1 hour restart reboot flight mode onoff still a problem update to 431 could bring a solution testing tomorrow
Matt Egan - Editor said: I took our own advice and set my alarm an hour early - I play football on Sunday mornings and you dont want to be the guy who forgets about the clocks going forward Of course my iPhone worked perfectly and I had an hour sitting around feeling tired to think about that fact
Rosie Posie said: My iPhone dutifully woke me up 5 mins before the start of the race I wonder why some iPhones seem to get this glitch and others dont
John said: Not sure about the truth of these reports My alarm went off 2 hours early It was set for 9am 8am before daylight saving sent the clocks forward but it actually went off at 7am 8am before daylight saving As for buying a Nokia I have one of those Its crap
Wizard said: So you buy The best smart phone in the world and it turns out to be worse than a 20 nokia but didnt you pay over 600 for it Your all stupid and keep giving apple more and more money
lee j said: my alarm didnt go off this morning went off an hour early so woke up and set again and didnt go off
Chunky said: Set my i phone alarm for 425 sunday morning but failed to go off so i was late for workSet my alarm for the same time monday morning the alarm did actually go off but 325Wouldnt advise anyone t o buy an i phone total crap