SECOND returns the second for the given time value. The second is returned as an integer 0 - 59.

SECOND(`number`)

`number` is
a time value represented by a decimal for which the second is to be
returned.

`=SECOND(NOW())` returns
the current second.

`=SECOND(C4)`) returns `17` if
the content of C4 is 17:20:17.

`=SECOND(0.00019676)`)
returns `17` as the time value is the same
as
`=SECOND(17/(24*60*60))` and corresponds to 12/30/1899
00:00:17.