The 5 April year end for income tax reflects the old civil and ecclesiastical calendar under which New Year began on 25 March ("Lady Day"). The difference between the two dates is accounted for by the eleven days omitted in September 1752 due to the Calendar (New Style) Act 1750 by which the Great Britain also converted from the Julian Calendar to the Gregorian Calendar. However, although the calendar year finished on 24 March, the tax year finished a day later, on 25 March, the Quarter Day.