The Christmas tree lighting in New York City is typically a major event, and the exact date and time can vary from year to year. The lighting of the famous Rockefeller Center Christmas tree is usually held in early December, usually around the second or third week. However, it's important to check the official schedule and updates from the Rockefeller Center or the New York City government for the most accurate and up-to-date information, as the date can change depending on various factors such as weather conditions or other events taking place in the city.