Incorrect. Caesar was assassinated on this date in 44 BC but not this day because the English (including the American colonials) changed to the Gregorian Calendar in 1752 (the year when 2 September was followed by 14 September). If figured against the position of the earth relative to the sun on 1 Jan in the modern calendar versus the position on Roman 1 Jan, the solar anniversary of Caesar's murder isn't for another 11 days.
Date, yes. Day, no.
Thanks.