# FLOOR
<a name="sql-reference-floor"></a>

```
FLOOR ( <time-unit> )
```

When called with a numeric argument, FLOOR returns the largest integer equal to or smaller than the input argument.

When called with a date, time, or timestamp expression, FLOOR returns the largest value equal to or smaller than the input, subject to the precision specified by <time unit>.

FLOOR returns null if any input argument is null.

## Examples
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|  Function  |  Result  | 
| --- | --- | 
| FLOOR(2.0) | 2 | 
| FLOOR(-1.0) | -1 | 
| FLOOR(5.2) | 5 | 
| FLOOR(-3.3) | -4 | 
| FLOOR(-3 \* 3.1) | -10 | 
| FLOOR(TIMESTAMP '2004-09-30 13:48:23' TO HOUR) | TIMESTAMP '2004-09-30 13:00:00' | 
| FLOOR(TIMESTAMP '2004-09-30 13:48:23' TO MINUTE) | TIMESTAMP '2004-09-30 13:48:00' | 
| FLOOR(TIMESTAMP '2004-09-30 13:48:23' TO DAY) | TIMESTAMP '2004-09-30 00:00:00.0' | 
| FLOOR(TIMESTAMP '2004-09-30 13:48:23' TO YEAR) | TIMESTAMP '2004-01-01 00:00:00.0' | 

## Notes
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**Note**  
FLOOR ( <datetime expression> TO <timeunit> ) is an Amazon Kinesis Data Analytics extension.  
The STEP function is similar to FLOOR but can round values down to arbitrary intervals, such as 30 seconds. For more information, see [STEP](sql-reference-step.md).