# Time - Second

### Table of Contents

## About

The second is the base unit of time in the International System of Units (SI).

The length of an SI second was defined to be very close to the 86400th fraction of a day.

## Articles Related

## Fractional

A fractional second is fraction of a second (generally on a millisecond precision)

The SQL ansi standard defines them as the number of decimal digits following the decimal point in the seconds value.