CHECK: We have been told you cannot cut your nails (Wednesday), can you cut your hair on certain days?
In the name of Allah the most Beneficent and Merciful.
It is Sunnah to cut hair and nails on a Friday before the prayers. To cut nails on every day is fine except for Wednesdays. Imam Haskafi explains in his Durr-e-Mukhat with evidence by Imam Tahawi that to cut nails on a Wednesday has been disapproved by a weak Hadith and as it is safe to protect yourself it is better not to cut them on Wednesdays as it could lead to leprosy. The disapproval of cutting hair on Wednesday has not been mentioned.
Of course Allah knows best