What is the ruling on one who refuses to use the time schedules and relies on seeing the sun?

Question:
Some of the youth refuse to use the time schedules, such as the Umm al-Qura calendar. Some of the youth, what is it? They refuse to use them. They refuse to use the time schedules, such as the Umm al-Qura calendar. They claim that they rely on seeing the sun, and sometimes the sky is very cloudy, and they do not rely on the time schedules. They may break their fast in Ramadan before the time specified in the schedule. Is their action correct?

Answer:
My brothers, I have told you more than once: beware of eccentricity, beware of eccentricity. The one who fasts with the Muslims breaks his fast with the Muslims, with the community of Muslims. This is the obligatory duty. As for eccentricity by opinion, and that he breaks his fast and fasts and opposes the Muslims, this is not permissible. This is absolutely not permissible for him. The Prophet (peace and blessings be upon him) said: "Your fasting is the day you fast, and your breaking of the fast is the day the people break their fast" .
The Muslims, if Allah wills, have good in them. So it is not permissible for an individual to oppose the Muslims. And in the hadith: And in the hadith:
You are in a Muslim, conservative society, and praise be to Allah, one that is keen to act according to the Sunnah. Do not oppose them in your independent legal reasoning and inclinations, or let some of the callers to misguidance deceive you, who want to scatter the Muslims and divide their community in these matters. Beware of eccentricity, beware of eccentricity in fasting and in other matters.
Fast with the Muslims and break your fast with the Muslims, and praise be to Allah. The Umm al-Qura calendar is a place of trust because it is studied, approved, and implemented by the state after verification. So acting according to it is without doubt, and the Muslims rely on it in the call to prayer and in the prayer, and no error has been found in it. Those who say that there is an error have no knowledge and no understanding; it is nothing but conjecture, conjecture. This calendar has committees and astronomers and scholars who have exerted effort in investigating and applying it, so it is, if Allah wills, approved and a place of trust. Yes.