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# TIMESTAMP_TRUNC

## Overview

The `TIMESTAMP_TRUNC()` function rounds a timestamp to a specific `day_time` granularity, resulting in a truncated timestamp.

### Syntax

```sql  theme={null}
SELECT TIMESTAMP_TRUNC(TIMESTAMP 'YYYY-MM-DD hour:min:sec', day_time);
```

`day_time` can be replaced with various time values as follows:

* `SECOND`
* `MINUTE`
* `HOUR`
* `DAY`
* `MONTH`
* `YEAR`

## Examples

### Case #1: `TIMESTAMP_TRUNC()` - Hour

The following example shows how to round the hour to the closest value:

```sql  theme={null}
SELECT TIMESTAMP_TRUNC(TIMESTAMP '2017-09-18 14:43:39.02322', HOUR) ;
```

The final result will display the current date and time in your timezone:

```sql  theme={null}
+-----------------------------+
| f                           |
+-----------------------------+
| 2017-09-18 14:00:00.00000   |
+-----------------------------+
```

### Case #2: `TIMESTAMP_TRUNC()` - Minute

Here we will truncate the specified timestamp into the nearest value:

```sql  theme={null}
SELECT TIMESTAMP_TRUNC(TIMESTAMP '2005-03-18 14:13:13', MINUTE) ;
```

The result will return the truncated timestamp as shown below:

```sql  theme={null}
+-----------------------------+
| f                           |
+-----------------------------+
| 2005-03-18 14:13:00.00000   |
+-----------------------------+
```

### Case #3: Basic `TIMESTAMP_TRUNC()` function - Year

Run the following query to round the date to the closest value:

```sql  theme={null}
SELECT TIMESTAMP_TRUNC(TIMESTAMP '2023-03-04', YEAR);
```

The function will truncate the year and return the following result:

```sql  theme={null}
+-----------------------------+
| f                           |
+-----------------------------+
| 2023-01-01 00:00:00.00000   |
+-----------------------------+
```