I have heard some sheikhs predicting the year in which Imam Mahdi or Isa (pbuh) will be on earth. They also show some mathematical calculation to support their statement. Should we believe them?
Of course not! Believing in such predictions can nullify a person’s Islam as he is claiming to know the future!
Nobody has this knowledge but Allah and claiming to know this or predicting future events is absolutely prohibited in Islam and what they claim is totally baseless.