Based on the search results, it is not clear which Jewish holiday it is today. Some of the Jewish holidays that have already occurred in 2023 include Tu B’shevat, Purim, Pesach/Passover, Yom Hashoah, Yom Hazikaron, and Shavuot. However, there is no information on which Jewish holiday is being celebrated today. Additionally, one of the search results states that there is no Jewish holiday today. It is important to note that Jewish holidays begin and end at sunset, rather than at midnight, as in the Gregorian calendar.