Among the Muslims today there is no unity in their dates. This is due to ignorance and foolishness. There are newspapers and calendars, which show different Hijra dates for the same Day! If there is no unity in dates, people cannot record the dates of birth of their children according to the Islamic calendar. Children born on the same day will have different dates of birth! How can the Islamic calendar be practicable if the Shariah permitted this? How can the Muslims fix the date for a program in advance according to their calendar, if the dates cannot be calculated? If the Hilal must be seen with the naked eyes to begin every month the dates cannot be predicted and the dates would be liable to change at the whims of the people! How could this be permissible in Islam, the Right Religion prescribed by Allah (swt) for the people?
The Islamic Calendar is perfect and all other man-made calendars used in this world today are defective and susceptible to change in the course of time. The fact that Islam has taught a dating system, which is free of error and not susceptible to any change at a time when the world had no idea about the recording of time, can be treated as evidence that Islam is divine.