Humans are interesting beings. They love things to work their way. They try and alter every possible thing/ phenomenon/ rule as per their own will. The fixation with changing things runs so high, that people even try and make time run by their own set standards.
Lets say the time right now is 1800 hrs(6 pm). While your neighbour might have his watch set to the right time(6 pm), your close friend's watch from school/college/work might show the time to be 6:10 pm. On questioning your friend's decision of fiddling with nature's creation, he will simply say that changing time helps him stay punctual. The argument here is, that the individual who has reset his/her watch constantly knows through the day that time by their watch is a few minutes 'ahead' of actual time, so how does it really help the person be any quicker in life?