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Old Style and New Style dates

Old Style and New Style dates
(O.S.) George Hickes, English minister and scholar (d. 1715)

Old Style (O.S.) and New Style (N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and 1923.

20 June 1642

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