Time

What is a Day? (d)

Definition

A day is a unit of time equal to 24 hours, 1,440 minutes, or 86,400 seconds. It corresponds to one complete rotation of the Earth on its axis. Days are the primary unit for calendars, scheduling, project planning, and counting durations in everyday life.

Common Uses

  • › Calendar and date calculations
  • › Deadlines and project timelines
  • › Age and duration counting
  • › Medical and prescription intervals

Converters

Days to Hours → Days to Weeks → Days to Years →

Key Facts

  • Symbol
    d
  • Category
    Time
  • 1 day = 24 hr
  • 1 day = 1,440 min
  • 1 day = 86,400 s
  • 7 days = 1 week
  • 365 days ≈ 1 year

Related Terms

About the Day

A day is a unit of time equal to 24 hours, 1,440 minutes, or 86,400 seconds. It corresponds to one complete rotation of the Earth on its axis. Days are the primary unit for calendars, scheduling, project planning, and counting durations in everyday life.

Equivalents and conversions

  • 1 day = 24 hr
  • 1 day = 1,440 min
  • 1 day = 86,400 s
  • 7 days = 1 week
  • 365 days ≈ 1 year

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