The ROUNDDOWN function acts similarly to the ROUND function, except that it always rounds down (toward zero (0)).
Command Syntax:
ROUNDDOWN ([parameter1])
ROUNDDOWN ([parameter1]+[parameter2]+[parameter3]… )
ROUNDDOWN ([parameter1]-[parameter2]-[parameter3]… )
EXAMPLE:
This formula sets a value to the next whole number closer to zero (i.e. the values 13 or -13, respectively).
ROUNDDOWN (13.1)
ROUNDDOWN (-13.1)