According to dharma sastras, may I know the general days in a week (from Sunday-Saturday) or certain important tithis / nakshatrams when shaving / hair cut is not permitted?
This information will be very useful.
First of all for a gruhastha just haircut and shaving the face itself is not permitted. He has to do sarvanga kshavaram once in a month or in dire needs once in a paksham. Avoid paurnami, amavasya, masa pravesam, Tuesday Friday Saturday, pandigai days, sraddham days.