Problems with the iPhone's clock and how it adjusts itself for daylight savings time have cropped up again.

The Telegraph reports dozens of people claiming on social networks such as Facebook and Twitter that their iPhones have gone back an hour, rather than forward by one hour as they were supposed to do.

The iPhone clock bug last struck over the New Year, when one-off alarms set in the first few days of 2011 failed to go off.

Last year, when the clocks were adjusted for daylight saving time in November, many European iPhone owners reported that though the clock on the device had gone backwards by one hour, the alarm was going off one hour later than it had been set for.

The UK doesn't change its clocks until the weekend of Saturday 26 - Sunday 27 March - how the iPhone will cope remains to be seen.