Day
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24 hours
About Day (d)
One mean solar day equals exactly 86,400 SI seconds by convention, though Earth's actual rotation varies slightly. The day is the most natural time unit, governing sleep cycles, medication schedules, and shipping delivery promises. Leap seconds occasionally adjust UTC to keep civil time aligned with Earth's rotation.
- Category
- Time
- Symbol
- d
- Also known as
- days
CONVERT TO
Frequently Asked Questions
What is a Day (d)?
24 hours
How many Hour (h) are in one Day (d)?
One Day (d) equals 24 Hour (h).
How many Week (wk) are in one Day (d)?
One Day (d) equals 0.142857 Week (wk).
How many Year (yr) are in one Day (d)?
One Day (d) equals 0.002737907 Year (yr).
How do I convert Day to Hour?
To convert Day to Hour, multiply the value by 24 (1 d = 24 h).