“Have a nice day” is just a way to wish someone a good day. It is often said to someone at the beginning of the day, wishing him or her luck so that the day proceeds well. This is one nice way to start the day on a positive note. If you wish someone luck, his or her day might probably start on a good note. Say this to people to wish them a great and happening day. Well begun is half done. If the day starts or takes off well, it is almost certain that great things will follow throughout the course of the day. This is just a genial way of wishing someone a nice and happy day. Your good wishes can go a long way in making someone’s day. So, use this method of greeting people when you meet them early morning and wish their day to be perfect. Alicia Keys had remarked, “When I was younger, studying classical music, I really had to put in the time. Three hours a day is not even nice - you have to put in six.”
