New Style

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New Style

the present method of reckoning dates using the Gregorian calendar
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

New Style

(NS) The current method of measuring dates using the Gregorian calendar as distinct from the former method – Old Style (OS) – that was based on the Julian calendar. Britain and the American colonies switched calendars on Sept. 14 1752, the 11 days from Sept. 3 to Sept. 13 having been eliminated from that year.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006