How do I convert Day to Second (s)?

1 day equals 86400 s using SI-based conversion and precise factors.

What is the formula to convert Day to Second (s)?

This is a linear unit conversion using a constant factor between units.

Yes, it uses exact definitions or standardized constants (e.g., 1 in = 25.4 mm).

Use the shareable URL pattern: /convert/day-to-s/1

Category: Time

Value From To Precision

86400 s

1 day = 86400 s

High-precision rounding: 6 decimals

We convert by pivoting through the SI base unit for Time and applying exact factors where applicable.

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Timekeeping blends SI seconds with civil conventions.

Day

24 hours (civil); astronomical definitions vary slightly.

History: Rooted in Earth’s rotation.

Second (s)

SI base unit of time; defined via cesium-133.

History: Modern definition from atomic transitions.