Seconds to Days Converter

Common questions

How many seconds are in a day?

86,400. A day of 24 hours, each of 60 minutes of 60 seconds, is 24 × 60 × 60 = 86,400 seconds, so one day is 86,400 s, two days are 172,800 s and a week is 604,800 s. Dividing by that figure is the whole conversion: 43,200 seconds comes back as 0.5 days, 259,200 seconds as 3 days and 2,592,000 seconds as 30 days.

Why can a real calendar day differ from 86,400 seconds?

Because a calendar day is tied to clocks and to the Earth, not to arithmetic. A UTC day that carries a leap second is 86,401 seconds long, and a local day on which the clocks go forward or back is 23 or 25 hours, so 82,800 or 90,000 seconds. Type those into this page and it answers 1.00001157407, 0.958333333333 and 1.04166666667 days, because it always divides by a fixed 86,400. It has no idea which date you mean. When the dates themselves matter, the duration calculator counts between two real dates and respects the calendar.

How do I turn a difference between two timestamps into days?

Subtract the earlier Unix timestamp from the later one, which leaves a plain count of seconds, and type that difference into the From box. A gap of 1,234,567 seconds is 14.2889699074 days, and a gap of 10,000,000 seconds is 115.740740741 days. Thousands separators are fine: 1,234,567 and 1234567 are read the same way. If your timestamps are in milliseconds, pick Millisecond in the From menu instead of dividing by 1,000 first, and the epoch converter turns the timestamps themselves into readable dates.

Worked example: how many days is 500,000 seconds?

500,000 / 86,400 = 5.78703703704 days, which is what the page prints as you type. To read that as clock time, take the 5 whole days and multiply the 0.78703703704 left over by 24, which gives 18.8888888889 hours: 5 days, 18 hours, 53 minutes and 20 seconds. The list under the answer agrees, showing the same 500,000 seconds as 138.888888889 hours and 8,333.33333333 minutes.

Can I convert days back to seconds here?

Yes. The swap button between the two boxes reverses the pair, so the page becomes days to seconds: 1 day gives 86,400, half a day gives 43,200 and 7 days give 604,800. Both unit menus stay open as well, so the same number will go from seconds to minutes, hours, weeks or years without leaving the page, and Copy result copies the figure exactly as printed, without the thousands separators.

What else does the page show under the answer?

The same number of seconds in every common time unit: milliseconds, minutes, hours, days, weeks and Julian years, each with its own Copy button. One million seconds reads as 1,000,000,000 ms, 16,666.6666667 min, 277.777777778 h, 11.5740740741 d, 1.65343915344 wk and 0.031688087814 yr. The Uncommon units switch in the row above adds 2 more, the nanosecond and the microsecond.

Is a year in that list 365 days?

No, it is the Julian year of 31,557,600 seconds, which is exactly 365.25 days. A common calendar year of 365 days is 31,536,000 seconds and a leap year of 366 days is 31,622,400 seconds, and the converter cannot tell which one you mean because it holds factors rather than a calendar. Type 31,536,000 seconds and it returns 365 days exactly.

Why does the page open on seconds and days when I last converted something else?

Because a page that names a pair should show that pair. This one sets seconds and days on arrival, ahead of whatever the converter last remembered, and it leaves the main unit converter's own memory alone: go back there and it is still on the pair you left it on. The number you last typed does travel with you, since it is usually the one you are still working on.

Is anything I type sent anywhere?

No. The conversion is arithmetic against a table of factors that ships with the page, so it runs in your browser with nothing uploaded and no account, and it keeps working with no network connection once the page has loaded.