The TRUNC() function takes a number and returns the first integer that is equal to or closer to zero than the argument:

TRUNC(5.5) === TRUNC(5.1) === TRUNC(5) === 5
TRUNC(-5.5) === TRUNC(-5.1) === TRUNC(-5) === -5

The TRUNC() function (v11.0+) takes a second optional parameter to indicate the number of digits to truncate to.

TRUNC(5.6789,2) === 5.67
TRUNC(-5.6789,2) === -5.67

• CEIL
• FLOOR
• ROUND
• See all Functions