Calendars and time
New Style Date
Direct answer
New Style Date: A New Style Date is a historical date expressed under a reformed calendar or year-start convention, commonly Gregorian dating after local adoption.
A New Style Date converts a historical date to the newer calendar convention.
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At a glance
- Found in
- Calendars & Timekeeping
- Related
- Old Style Date, Double Dating, Calendar, Julian Date
A New Style Date converts a historical date to the newer calendar convention.
A cycle or timeline schematic for comparing the named timekeeping concept.
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The story behind New Style Date
The term became common as Gregorian dating spread unevenly across Europe and its colonies.
Why New Style Date matters
New Style Date helps compare events recorded in countries that adopted calendar reform at different times.
How to read New Style Date
New Style Date beside Old Style notation applies when the conversion improves clarity and the adopted reform is known.
New Style Date in practice: an example
A New Style conversion may add a different number of days depending on the century of the original Julian date.
Where readings of New Style Date go wrong
The usual misreading is to apply today calendar offset uniformly to all historical centuries.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Introduction to Calendars - Official overview of calendar systems, leap rules, eras, and historical calendar reform.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Last updated
- 2026-09-26
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Common questions
What is a New Style Date?
A New Style Date is a historical date expressed under a reformed calendar or year-start convention, commonly Gregorian dating after local adoption.
What do people get wrong about a New Style Date?
The usual misreading is to apply today calendar offset uniformly to all historical centuries.
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