something happened to me last year where I have set my alarm clock at 7:30am on my phone, only to hear my alarm at 8:00am, and when i looked up my phone, i noticed the alarm was manually shifted by 30 mins after it had gone off at 7:30am, even though i was completely unaware..
there was also some strange metaphysical / dream experience accompanied that morning too. Not sure if it's coincidence. This kind of time loss experience only happened to me once.