Breaking the fast even a single day of Ramadan without excuse is a grave sin. There is no equivalent to the day one breaks in the daytime of Ramadan intentionally, even if one makes up for that day and pays the kaffarah (expiation for breaking the fast) later on. This is simply because there is a special sanctity to the daytime of the month of Ramadan. It was also narrated, on the authority of Abu Hurayrah (may Allah be pleased with him) that a man did not observe fast in Ramadan deliberately with no legal excuse. Hence, Abu Hurayrah said, “Even if he fasts for a whole year, he will still not have made up for that day.”
Dr. Muzammil Siddiqi, former President of the Islamic Society of North America and Director of the Islamic Society of Orange Country, Garden Grove, California, states the following: “Fasting during the month of Ramadan is an obligation fard upon every adult Muslim who is not sick or on a journey. It is a sin to miss the fasts of Ramadan without any excuse. The Prophet (peace and blessings be upon him) said, “Whoever broke even one fast of Ramadan without an excuse or sickness, even if he fasted the whole life after that it will not compensate what he missed.” (At-Tirmidhi)
As a Muslim, if you miss fasts without excuse and you regret your negligence, I suggest that you repent sincerely and ask Allah’s forgiveness. Allah has promised that if anyone repents sincerely, Allah accepts his repentance and forgives him. You should also try to make up for your missed days. Calculate how many days of Ramadan you missed. Make up for those days by fasting one day for each day that you missed. If you cannot then give the kaffarah, which is a day’s meals or its value to be given to a needy person. We estimate about ten dollars per day for each day’s fast.
Thus, by doing these deeds, you may not be able to compensate totally for the missed days of Ramadan, but at least you will express your sincere repentance and effort to fulfill the Commands of Allah.”