Sheikh Muhammad Iqbal Nadvi, Imam of Calgary Mosque, Canada, and Former Professor at King Saud University, Saudi Arabia, states the following: “There is no place for pessimism in Islam. A Muslim should be optimistic and put his trust in Allah in whatever comes to him. To link some actions with certain places, times, or specific circumstances is a kind of pessimism, which is highly condemned in Islam.
As far as the superiority of certain weekdays, there is no bad day in Islam. All days are days of Allah, and they should be spent in worship and righteousness. However, there are some degrees of reward different from one day to another. For example, Friday is a day on which reward is increased. But this does not mean that Saturday or Tuesday [or any other day] are bad days.
The Prophet (peace and blessings be upon him) forbade us from thinking evil of any time or day. He said that Allah Almighty said: “Do not insult time, for I am time.”