Can time be reversed

                        Direction of time 
According to Wikipedia;
Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.
                                                                 Source: Wikipedia
But how do we measure time? In fact there are two devices. First one is a clock which is used to measure time intervels a day. Second one is a calendar which is used to measure time interval  greater than a day.