SECOND Returns the seconds of a time value, as a number from 0 to 59.
Syntax
SECOND(time)
Parameters
time – A time in datetime format, such as 16:48:23 or 4:48:47 PM.
Return Value
An integer number from 0 to 59.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference