Day to Second Conversion Calculator: Free Online Tool
Convert days to seconds with our free online time converter.
Day to Second Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Day).
- The converted value in Second will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Time category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Day to Second
Converting Day to Second involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Day = 8.6400e+4 secondsExample Calculation:
Convert 60 days: 60 × 8.6400e+4 = 5.1840e+6 seconds
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
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What is a Day and a Second?
A day is a unit of time typically defined as 24 hours, which is equivalent to 1,440 minutes or 86,400 seconds. It roughly corresponds to one full rotation of the Earth on its axis relative to the Sun (a solar day).
The second is the base unit of time in the International System of Units (SI). It is defined by taking the fixed numerical value of the caesium frequency ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9,192,631,770 when expressed in the unit Hz, which is equal to s⁻¹.
Note: The Day is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Second belongs to the imperial/US customary system.
History of the Day and Second
The concept of a day as a fundamental cycle of light and darkness is ancient. The division into 24 hours developed over time, notably influenced by the Egyptians. While the solar day (time between two successive solar noons) varies slightly throughout the year, the standard mean solar day of 86,400 SI seconds is used for civil timekeeping.
Historically, the second was defined as 1/86,400 of a mean solar day. However, variations in the Earth's rotation led to the need for a more precise, constant definition. The atomic definition based on the caesium-133 atom was adopted in 1967.
Common Uses for days and seconds
Explore the typical applications for both Day (imperial/US) and Second (imperial/US) to understand their common contexts.
Common Uses for days
- Civil Timekeeping: The primary unit for organizing daily life, calendars, schedules, and dates.
- Astronomy: Used to measure rotational periods of planets and other celestial bodies (though the definition might differ, e.g., sidereal day).
- Duration: Measuring the length of events, projects, trips, or lifespans that span multiple hours.
- Biology: Studying circadian rhythms (biological processes that follow a roughly 24-hour cycle).
- Work & Rest: Structuring periods of work, leisure, and sleep.
Common Uses for seconds
- Base Unit: The fundamental unit for all time measurements in science, engineering, and daily life.
- Timing: Used universally for clocks, watches, timers, and scheduling.
- Physics: Essential in defining derived units like velocity (meters per second), acceleration (meters per second squared), frequency (Hertz, or cycles per second), and force (Newtons).
- Computing: Used as a base for measuring intervals, timeouts, and durations, although often subdivided into milliseconds, microseconds, or nanoseconds for finer measurements.
- Everyday Life: Counting heartbeats, measuring short durations, coordinating activities.
Frequently Asked Questions
Questions About Day (d)
How many hours are in a day?
There are typically 24 hours in a standard civil day.
How many seconds are in a day?
There are 86,400 seconds in a standard 24-hour day (24 hours * 60 minutes/hour * 60 seconds/minute).
Is every day exactly 24 hours long?
The apparent solar day (time from one noon to the next) varies slightly due to the Earth's elliptical orbit and axial tilt. The mean solar day, used for clocks, averages this out to 24 hours. Leap seconds are occasionally added to keep clock time aligned with the Earth's rotation.
What's the difference between a solar day and a sidereal day?
A solar day is based on the Sun's position (approx. 24 hours). A sidereal day is based on the Earth's rotation relative to distant stars (approx. 23 hours, 56 minutes, 4 seconds).
About Second (s)
What is the base unit of time in the SI system?
The second (s) is the base unit of time.
Why is the second defined using atoms?
The atomic definition provides a much more stable and precise standard than relying on the Earth's rotation, which fluctuates slightly.
How many seconds are in a minute?
There are 60 seconds in a minute.
How many seconds are in an hour?
There are 3,600 seconds in an hour (60 seconds/minute * 60 minutes/hour).
Conversion Table: Day to Second
| Day (d) | Second (s) |
|---|---|
| 1 | 86,400 |
| 5 | 432,000 |
| 10 | 864,000 |
| 25 | 2,160,000 |
| 50 | 4,320,000 |
| 100 | 8,640,000 |
| 500 | 43,200,000 |
| 1,000 | 86,400,000 |