The day conversion selector on this page selects the time measurement unit to convert to starting from days (d). To make a conversion starting from a unit of time other than day, simply click on the "Reset" button.
The day is a unit of time equal to 86,400 seconds (1 day = 86,400 s), the base unit of time in the International System of Units (SI). At irregular intervals, the Coordinated Universal Time (UTC) time scale is adjusted with leap seconds in order to keep the UTC time scale close to mean solar time. On these occasions, one day has 86,399 or 86,401 seconds.
One day (d) is also equal to 24 hours (h) or 1,440 minutes (min), which are non-SI units of time but accepted for use along with other SI units.