A propitious or auspicious date for important events; originally a superstitious term for days when one could avoid bad luck, now used generally for any lucky day.

(idiom) a fine time and a lucky day; an auspicious occasion, especially one chosen for a wedding; a good opportunity

an auspicious day and time; a lucky day for an important event

an auspicious day and time; a lucky day for a wedding or other significant event