The iPhone is a marvel of modern technology -- it can stream movies, edit video and even turn your voice into an R&B singer. Apparently, though, it has trouble telling time.

When daylight saving time kicked in Sunday, some Apple iPhones reportedly failed to jump ahead an hour and catch up.

Venting their frustrations on Twitter, some users complained that their phones fell back or ahead an hour or two over the weekend.

Erin Wormsbecker, a Twitter user from Vancouver, wrote:

I wish the clock on my #iPhone would stop paying games and fix itself!

Apple officials were unavailable for comment Sunday afternoon to address the reports. But, problems with an iPhone clock aren't particularly new for owners of the popular smart phone.

In January, some iPhone owners complained that the switch from 2010 to 2011 caused malfunctioning alarms for a run of about three days and daylight-saving-related problems also took place in November.

Another Tweeter, identifying herself as Dolores from Arizona (where there is no daylight saving time), also complained of clock problems, stating:

My iPhone was trippin this mornin. It set my clock an hr ahead, but I live in az

A Twitter user and iPhone owner named Jim Bass was dismayed his iPhone's clock actually worked Sunday morning, tweeting:

I have to admit that I was surprised when my iPhone alarm clock actually worked this morning. Set 2 other alarms just in case

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-- Nathan Olivarez-Giles

twitter.com/nateog

Photo: Customers browse Apple iPhones at the company's Sanlitun store in Beijing.

Credit: Nelson Ching / Bloomberg