Formal:
* शुभ दिवस (shubh divas): This is a very general and polite way to say "have a nice day." It literally means "good day."
* आपला दिवस सुखकर असो (aapla divas sukhakar aso): This means "may your day be pleasant." It's a slightly more formal and well-wishing way to say "have a nice day."
Informal:
* छान दिवस घ्या (chhan divas ghya): This is a more casual way to say "have a nice day" and literally means "have a good day."
* दिवस छान जाओ (divas chhan jao): This means "have a good day" and is more casual.
* शुभेच्छा (shubhechha): This is a general well-wishing word that can be used to say "have a nice day" in a casual context.
The best way to say "have a nice day" in Marathi will depend on the specific situation and your relationship with the person you are speaking to.