The notation `` Old Style '' -LRB- OS -RRB- is sometimes used to indicate a date in the Julian calendar , as opposed to `` New Style '' -LRB- NS -RRB- , which either represents the PERSON@1 date with the start of the year as NUMBER@1 January or a full mapping onto the MISC@1 calendar .

People sometimes use the term Old Style or O.S. to refer to the PERSON@1 calendar , with PERSON@2 or New Style referring to the MISC@1 calendar .
