This is a good article that explains why there cannot be a fixed start date for the month of Ramadan. There are Wahhabi/Salafi hypocrites who claim to be the authority in Islam but they are what I just said…. just hypocrites… Do not follow them. Ramadan starts with the “Sighting” of the moon with the naked eye.
Here is the Full Article.. Please read this and talk to the local Mosque Imam to confirm the dates.