How do I convert days to seconds?

To convert days to seconds, multiply the value by 8.6400e+4. For example, 1 d = 8.6400e+4 s.

What is 1 days in seconds?

1 days (d) is equal to 8.6400e+4 seconds (s).

How do I convert seconds back to days?

To convert seconds back to days, multiply the value by 1.1574e-5. For example, 1 s = 1.1574e-5 d.

What is the formula to convert days to seconds?

The formula is: s = d × 8.6400e+4. Simply multiply your days value by 8.6400e+4 to get the equivalent in seconds.

What is a time unit converter?

A time unit converter is a tool that transforms measurements between different units of time, from femtoseconds to millennia. It's essential for scientific calculations, project planning, travel scheduling, and understanding historical timescales.

What is the standard SI unit of time?

The second (s) is the SI base unit of time. It's defined by the radiation cycles of cesium-133 atoms—specifically, 9,192,631,770 cycles equal one second. This atomic definition provides incredible precision, accurate to within one second in millions of years.

Where are time conversions important?

Time conversions are essential in project management (days to hours), scientific research (milliseconds to nanoseconds), astronomy (years to centuries), computing (seconds to milliseconds), travel planning (time zones), and historical research (years to decades).

Why are different time units used?

Different scales require different units for practical measurement. We use nanoseconds for computer operations, seconds for human reflexes, hours for daily activities, and years for life events. Using appropriate units makes numbers more manageable and meaningful.

How many seconds are in a day?

There are exactly 86,400 seconds in a day (24 hours × 60 minutes × 60 seconds). This is the basis for many time calculations. A week has 604,800 seconds, and a common year has 31,536,000 seconds.

What is the difference between a common year and a leap year?

A common year has 365 days (31,536,000 seconds), while a leap year has 366 days (31,622,400 seconds). Leap years occur every 4 years (with exceptions for century years) to keep our calendar aligned with Earth's orbit around the sun.

What is a synodic month?

A synodic month (29.53 days) is the time between identical moon phases, like full moon to full moon. It's different from a calendar month and was the basis for many ancient calendars. Twelve synodic months equal about 354 days, which is why lunar calendars drift relative to the seasons.

How small can time measurements get?

Modern physics measures time in incredibly small units: milliseconds (10⁻³), microseconds (10⁻⁶), nanoseconds (10⁻⁹), picoseconds (10⁻¹²), femtoseconds (10⁻¹⁵), and even smaller. The shortest measured time is about 247 zeptoseconds (10⁻²¹ seconds).

A fortnight equals 14 days or 2 weeks. The term comes from 'fourteen nights' and is still commonly used in British English and some Commonwealth countries for scheduling and payroll periods.

How is a year defined scientifically?

There are several 'year' definitions: the tropical year (365.24219 days) measures equinox to equinox, the Julian year (365.25 days) is used in astronomy, and the Gregorian calendar year averages 365.2425 days. Our calendar uses the Gregorian year with leap year rules.

Convert days to seconds

Time Unit Converter - d to s

days to seconds Formula

s = d × 86,400

To convert from days (d) to seconds (s), multiply the value by 86,400.

Example:

10 d = 864,000 s

Reverse:

1 s = 1.1574e-5 d

Quick Reference: days to seconds

days (d)	seconds (s)
1 d	86,400 s
5 d	432,000 s
10 d	864,000 s
25 d	2.1600e+6 s
50 d	4.3200e+6 s
100 d	8.6400e+6 s
500 d	4.3200e+7 s
1,000 d	8.6400e+7 s

About These Units

days (d)

Days is a unit of time measurement. It is one of the most commonly used units in this category.

seconds (s)

Seconds is a unit of time measurement. This is the base unit for this category. It is one of the most commonly used units in this category.

Time conversion table

1 s = 3.1709791983764586e-10 C	1 seconds equals 3.1709791983764586e-10 centuries	1 * 3.1709791983764586e-10 = X C
1 s = 0.000011574074074074073 d	1 seconds equals 0.000011574074074074073 days	1 * 0.000011574074074074073 = X d
1 s = 3.1709791983764586e-9 D	1 seconds equals 3.1709791983764586e-9 decades	1 * 3.1709791983764586e-9 = X D
1 s = 999999999999999.9 fs	1 seconds equals 999999999999999.9 femtoseconds	1 * 999999999999999.9 = X fs
1 s = 8.267195767195768e-7 ftn	1 seconds equals 8.267195767195768e-7 fortnights	1 * 8.267195767195768e-7 = X ftn
1 s = 0.0002777777777777778 h	1 seconds equals 0.0002777777777777778 hours	1 * 0.0002777777777777778 = X h
1 s = 1000000 μs	1 seconds equals 1000000 microseconds	1 * 1000000 = X μs
1 s = 3.1709791983764586e-11	1 seconds equals 3.1709791983764586e-11 millenia	1 * 3.1709791983764586e-11 = X
1 s = 1000 ms	1 seconds equals 1000 milliseconds	1 * 1000 = X ms
1 s = 0.016666666666666666 min	1 seconds equals 0.016666666666666666 minutes	1 * 0.016666666666666666 = X min
1 s = 3.8051750380517503e-7 month	1 seconds equals 3.8051750380517503e-7 months (Common)	1 * 3.8051750380517503e-7 = X month
1 s = 3.9193509056233435e-7 month	1 seconds equals 3.9193509056233435e-7 months (Synodic)	1 * 3.9193509056233435e-7 = X month
1 s = 999999999.9999999 ns	1 seconds equals 999999999.9999999 nanoseconds	1 * 999999999.9999999 = X ns
1 s = 1000000000000 ps	1 seconds equals 1000000000000 picoseconds	1 * 1000000000000 = X ps
1 s = 1.2683916793505834e-7	1 seconds equals 1.2683916793505834e-7 quarters (Common)	1 * 1.2683916793505834e-7 = X
1 s = 100000000	1 seconds equals 100000000 shakes	1 * 100000000 = X
1 s = 0.0000016534391534391535	1 seconds equals 0.0000016534391534391535 weeks	1 * 0.0000016534391534391535 = X
1 s = 3.1709791983764586e-8 y	1 seconds equals 3.1709791983764586e-8 years (Common)	1 * 3.1709791983764586e-8 = X y
1 s = 3.168873850681143e-8	1 seconds equals 3.168873850681143e-8 years (Average Gregorian)	1 * 3.168873850681143e-8 = X
1 s = 3.168808781402895e-8	1 seconds equals 3.168808781402895e-8 years (Julian)	1 * 3.168808781402895e-8 = X
1 s = 3.1623153207852664e-8	1 seconds equals 3.1623153207852664e-8 years (Leap)	1 * 3.1623153207852664e-8 = X
1 s = 3.168876540268821e-8	1 seconds equals 3.168876540268821e-8 years (Tropical)	1 * 3.168876540268821e-8 = X

F.A.Q. - Frequently Asked Questions

Popular time Conversions

centuries to days centuries to decades centuries to hours centuries to microseconds centuries to milliseconds centuries to minutes centuries to nanoseconds centuries to picoseconds centuries to seconds centuries to years (Common)days to centuries days to decades days to hours days to microseconds days to milliseconds days to minutes days to nanoseconds days to picoseconds days to seconds days to years (Common)decades to centuries decades to days decades to hours decades to microseconds decades to milliseconds decades to minutes decades to nanoseconds decades to picoseconds decades to seconds decades to years (Common)hours to centuries hours to days hours to decades hours to microseconds hours to milliseconds hours to minutes hours to nanoseconds hours to picoseconds hours to seconds hours to years (Common)microseconds to centuries microseconds to days microseconds to decades microseconds to hours microseconds to milliseconds microseconds to minutes microseconds to nanoseconds microseconds to picoseconds microseconds to seconds microseconds to years (Common)milliseconds to centuries milliseconds to days milliseconds to decades milliseconds to hours milliseconds to microseconds milliseconds to minutes milliseconds to nanoseconds milliseconds to picoseconds milliseconds to seconds milliseconds to years (Common)minutes to centuries minutes to days minutes to decades minutes to hours minutes to microseconds minutes to milliseconds minutes to nanoseconds minutes to picoseconds minutes to seconds minutes to years (Common)nanoseconds to centuries nanoseconds to days nanoseconds to decades nanoseconds to hours nanoseconds to microseconds nanoseconds to milliseconds nanoseconds to minutes nanoseconds to picoseconds nanoseconds to seconds nanoseconds to years (Common)picoseconds to centuries picoseconds to days picoseconds to decades picoseconds to hours picoseconds to microseconds picoseconds to milliseconds picoseconds to minutes picoseconds to nanoseconds picoseconds to seconds picoseconds to years (Common)seconds to centuries seconds to days seconds to decades seconds to hours seconds to microseconds seconds to milliseconds seconds to minutes seconds to nanoseconds seconds to picoseconds seconds to years (Common)years (Common) to centuries years (Common) to days years (Common) to decades years (Common) to hours years (Common) to microseconds years (Common) to milliseconds years (Common) to minutes years (Common) to nanoseconds years (Common) to picoseconds years (Common) to seconds