Dictionary term
Civil Day
Direct answer
Civil Day: A Civil Day is the locally dated interval from one civil midnight to the next under a jurisdiction's timekeeping rules.
A Civil Day is the midnight-to-midnight day used for legal and everyday dates.
A Civil Day is the midnight-to-midnight day used for legal and everyday dates.
A cycle or timeline schematic for comparing the named timekeeping concept.Quick reference
- Use when
- Use Civil Day for deadlines, records, billing, and local-date calculations that must respect zone rules.
- Do not use it for
- Do not calculate civil-day duration from a date alone; include location and time-zone history.
- Reference category
- Calendars & Timekeeping
- Related terms
- Sidereal Day, Astronomical Day, Calendar, Julian Date
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The story behind Civil Day
Midnight-based civil days became standard after older traditions also used sunset, sunrise, or noon boundaries.
Civil Day in spiritual tradition
Spiritually, the civil day supports shared responsibility through an agreed local boundary.
Civil Day: fact and faith, kept distinct
This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.
Civil Day in numerology
Civil Day is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Civil Day matters
Time-zone changes and daylight-saving transitions mean a civil day is not always exactly 24 clock hours.
Civil Day at work: an example
A daylight-saving spring transition can create a 23-hour Civil Day in local clock time.
Where interpretation stops
Civil Day is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- NIST: Local Time Frequently Asked Questions - Official reference for time zones, offsets, daylight-saving rules, and civil time.
- 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
- Also appears in
- Calendars & Timekeeping
- Aliases
- None listed
- Last updated
- 2026-07-16
Include the time zone
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More in Calendars & Timekeeping
- DUT1
- GPS Time
- ISO Week Date
- Local Sidereal Time
- Proleptic Julian Calendar
- Solar Noon
- UTC Offset
- Barycentric Coordinate Time
Common questions
What is Civil Day?
A Civil Day is the locally dated interval from one civil midnight to the next under a jurisdiction's timekeeping rules.
How is Civil Day used in an almanac?
Use Civil Day for deadlines, records, billing, and local-date calculations that must respect zone rules.
What should I avoid when interpreting Civil Day?
Do not calculate civil-day duration from a date alone; include location and time-zone history.
