The old clock

One day a family moved to a new house. the house was old and messy. they started to tidy up. in the middle of tidying up, the husband found a special alarm clock. it look aged but precious. he washed the clock and put it in his bedroom. after dinner his wife went outside to buy something. he went to bed to get some sleep, he thought that he was going to sleep until his wife came back, so he set the alarm clock at 9 o'clock and he pressed the button to set it. at that moment he moved in time to 9 o'clock

He was suprised but he quickly recongized the situation and that it was related to special alarm clock, so he decided to go to the near future. he reset the alarm again and he pressed the button. he moved in time to next week.

He was in his room and his wife was in the room too. his wife said to him "this is one of your futures i have been waiting for you, i'll tell you our past of your future but i think you have a choice. you will move in time to the first day when we moved to our new house. after that you will explain me about the clock and everything. however you are going to have an accident and you will die to save me. an accident took place the day before yesterday. that day was a usual day like other days. we were walking on the street in front of our house, suddenly it started to rain then a car crashed into us. you pushed me and you died. so if you go to the past you have to avoid this situation ok?"

He answered "ok, i understand" and he reset the alarm clock after 2 minutes later and pushed the button. like others he moved in time two minutes later.

His wife was still there and asked him "honey where have you been?, i have been looking for you for a long time, where did you go last week?".