Old Style and New Style dates

On this marriage certificate, made out in 1907 in Warsaw (then part of the Russian Empire), the month is given as

Issue 9198 of the London Gazette, covering Great Britain's switch from O.S. to N.S.

Thomas Jefferson's tombstone. Written below the epitaph is

Old Style (O.S.) and New Style (N.S.) are sometimes used with dates to indicate whether the Julian year has been adjusted to start on 1 January (N.S.), even though documents written at the time use a different start of year (O.S.), or whether a date conforms to the Julian calendar (O.S.), formerly in use in many countries, rather than the Gregorian (N.S.). Closely related is double dating, which uses two consecutive years because of differences in the starting date of the year, or includes both the Julian and Gregorian dates.

单词	Stilo novo
释义	Stilo novo 英语百科 Old Style and New Style dates Old Style (O.S.) and New Style (N.S.) are sometimes used with dates to indicate whether the Julian year has been adjusted to start on 1 January (N.S.), even though documents written at the time use a different start of year (O.S.), or whether a date conforms to the Julian calendar (O.S.), formerly in use in many countries, rather than the Gregorian (N.S.). Closely related is double dating, which uses two consecutive years because of differences in the starting date of the year, or includes both the Julian and Gregorian dates.
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Stilo novo

Old Style and New Style dates