Calendars and time
Civil Calendar
Direct answer
Civil Calendar: A Civil Calendar is the calendar adopted by a government or society for legal dates, administration, commerce, and public life.
A Civil Calendar supplies the official dates used in everyday public affairs.
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At a glance
- Found in
- Calendars & Timekeeping
- Related
- Calendar Year, Proleptic Gregorian Calendar, Calendar, Julian Date
A Civil Calendar supplies the official dates used in everyday public affairs.
A cycle or timeline schematic for comparing the named timekeeping concept.
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The story behind Civil Calendar
Many states eventually adopted the Gregorian calendar for civil purposes while communities continued using other calendars for religious observance.
Why Civil Calendar matters
Civil Calendar clarifies why an official date can differ from a religious, agricultural, regnal, or astronomical date label.
How to read Civil Calendar
Civil Calendar comes up when interpreting laws, records, contracts, holidays, historical documents, and cross-border date conversions.
Civil Calendar in practice: an example
A country may use Gregorian dates on passports while also publishing holidays from a lunar or lunisolar religious calendar.
Where readings of Civil Calendar go wrong
A common error is to assume the current civil calendar was used throughout a country's entire history or adopted everywhere at once.
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.
- ISO: ISO 8601 Date and Time Format - Standards-body overview of unambiguous international date and time representations.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Last updated
- 2026-09-26
Identify the official date system
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More in Calendars & Timekeeping
- Draconic Year
- Golden Number
- International Atomic Time
- Local Mean Solar Time
- Solar Calendar
- UT1
- Astronomical Year Numbering
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Common questions
What is a Civil Calendar?
A Civil Calendar is the calendar adopted by a government or society for legal dates, administration, commerce, and public life.
What do people get wrong about a Civil Calendar?
A common error is to assume the current civil calendar was used throughout a country's entire history or adopted everywhere at once.
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