(Old Style date; September 16 per New Style date.)

"Old Style date" (as "O.S."), a date designation indicating derivation from the Julian Calendar, as opposed to "N.S." indicating derivation from the Gregorian Calendar (see Old Style and New Style dates)

On Sunday, January 9, 1905 (Old Style date) Gapon organized a "peaceful workers' procession" to the Winter Palace in order to present a petition to the Tzar.

When transitioning from one date notation to another, people often write both Old Style and New Style dates.

Although claiming to use a modification for Old Style dates, the one he uses to determine that "1676, February 23" is a Wednesday, only works on the New Style Julian calendar.

The Pilgrims used the Julian Calendar, also known as Old Style dates, which, at that time, was ten days behind the Gregorian Calendar.

Samuel Adams was born in Boston in the British colony of Massachusetts on September 16, 1722, an Old Style date that is sometimes converted to the New Style date of September 27.

This apparent confusion is due to the burial date being an Old Style date.

For information about the changeover from the Julian calendar to the Gregorian calendar and the effect on the dating of historical events etc., see Old Style and New Style dates.