Praise be to Allah, and may peace and blessings be upon the Messenger of Allah.
Anyone who specifies a particular date for the beginning of the Hour, such as saying that it will occur on Friday, the tenth of Muharram, is making a false claim with no evidence. The time of the Hour is known only to Allah.
Allah, Glorified and Exalted, says:
“They ask you about the Hour: When is its appointed time? Say: Its knowledge is only with my Lord. None can reveal its time except Him.” [Al-A'raf 7:187]
As for what has been narrated that the Hour will occur on a Friday, this does not mean that anyone can determine the day, month, or year. Rather, if it occurs on a Friday, it will happen by Allah's command. At that point, the entire order of the universe will change, and the conditions of night and day, the sun, moon, and stars will no longer remain as they are known to us.
Therefore, it is not correct to be preoccupied with determining the date of the Hour or with questions arising from differences in dates between countries, because its timing is part of the unseen, the knowledge of which Allah has kept exclusively to Himself.
And Allah knows best.