A red letter day (sometimes hyphenated as red-letter day or called scarlet day in academia) is any day of special significance or opportunity. Its roots are in classical antiquity; for instance, important days are indicated in red in a calendar dating from the Roman Republic (509–27 BC). In medieval manuscripts, initial capitals and highlighted words (known as rubrics) were written in red ink. The practice was continued after the invention of the printing press, including in Catholic liturgical books. Many calendars still indicate special dates, festivals and holidays in red instead of black. In the universities of the UK, scarlet days are when doctors may wear their scarlet 'festal' or full dress gowns instead of their undress ('black') gown. In Norway, Sweden, Hong Kong, South Korea, Indonesia and some Latin American countries, a public holiday is sometimes referred to as "red day" (rød dag, röd dag, 빨간 날, 紅日, tanggal merah), as it is printed in red in calendars. Legal On red letter days, judges of the English High Court (Queen's Bench Division) wear, at sittings of the Court of Law, their scarlet robes (see court dress). Red letter days for these purposes are a fixed selection of saints' days (sometimes coinciding with the traditional start or end dates of the legal terms during which sittings of the High Court take place) and of national celebrations, mostly associated with senior members of the British royal family (and, therefore, changing from generation to generation). Current red letter days in the United Kingdom The list of red letter days currently observed in the United Kingdom (and on which, if a weekday, judges of the English High Court (King's Bench Division) traditionally wear, at sittings of the Court of Law, their scarlet robes) is as follows: October 18th (St Luke) 28th (St Simon and St Jude) November 1st (All Saints) 14th (King Charles III, born, 1948) 2nd Saturday in November (Lord Mayor's Day) 30th (St Andrew) December 21st (St Thomas) January 25th (Conversion of St Paul) February 2nd (Candlemas) 6th (Queen's Accession, 1952) Moveable (Ash Wednesday) 24th (St Mathias) March 1st (St David) 25th (Lady Day) April 21st (Queen Elizabeth II born, 1926) 25th (St Mark) May 1st (St Philip and St James) Moveable (Ascension Day) June 2nd (Coronation of Queen Elizabeth II, 1953) 2nd Saturday in June (Queen's Official Birthday) 10th (Duke of Edinburgh born, 1921) 11th (St Barnabas) 24th (St John