Convert time instantly, with the working shown.
Converting between seconds, minutes, hours and days is straightforward because the factors are fixed: 60, 60 and 24. Multiply going down the scale, divide going up. A day is 86,400 seconds, an hour is 3,600. Up to this point time behaves like any other unit system.
The pattern breaks at months and years, and this is where conversions quietly become approximations. Months range from 28 to 31 days, so "one month" has no fixed length in seconds; tools typically use 30 days or 30.44, the average across a year. A year is 365 days, except leap years, so an average year is about 365.25 days — and the number of seconds in "a year" depends on which convention you pick. For anything financial or legal, convert between actual dates rather than multiplying by an average month, because the difference accumulates. A further subtlety: not every minute has 60 seconds, since leap seconds have occasionally been inserted to keep clocks aligned with the Earth's rotation.
86,400, from 24 hours x 60 minutes x 60 seconds. This holds except on days when a leap second has been inserted, which is rare and only relevant to precision timekeeping.
There is no exact answer, which is why conversions involving months are approximate. Tools commonly use 30 days, or 30.44 as the average across a year. For precise work, calculate between actual dates instead.
Because some use 365 days and others 365.25 to account for leap years. Over one year the difference is small; over a long span it becomes noticeable, so it is worth knowing which convention a tool applies.
An occasional one-second adjustment added to keep atomic time aligned with the Earth’s slightly irregular rotation. It means a rare minute contains 61 seconds, which matters for precision systems but not everyday conversion.