Today is Yom HaShoah, also known as Holocaust Remembrance Day- a day set aside to remember the approximately 6 million Jews who dird in the Holocaust. In Isreal this day is typically observed by air-raid sirens sounding at 10 am for 2 minutes, during which time the entire country stops (including cars) and stands at attention to pay tribute to the dead. Flags are flown at half-mast and places of entertainment are closed. It is always celebrated on the 27th day of Nisan, the first month of the year in the Jewish calendar. So that means it may be celebrated on a different day according to our calendar, but it will not vary much.