> ## Documentation Index
> Fetch the complete documentation index at: https://docs.anlytic.com/llms.txt
> Use this file to discover all available pages before exploring further.

# LastDay

Evaluates a specified date component in a date value and returns the last date and time in that component as a timestamp.

**Category:** `date`

**Syntax:**

```
LastDay([date], "precision")
```

**Returns:** `DateTimeColumn`

**Context Filtering:** ✓ Yes

## Parameters

| Name        | Type               | Required | Description                                                                   |
| ----------- | ------------------ | -------- | ----------------------------------------------------------------------------- |
| `date`      | `column\|datetime` | ✓ Yes    | The date or column of date values from which the date component is extracted. |
| `precision` | `text`             | ✓ Yes    | The date component to evaluate for its last date and time.                    |

**Allowed Values for `precision`:** `year`, `quarter`, `month`, `week`

**Allowed Column Types:** DATETIME, DATE

## Validation

* Minimum parameters: 2
* Maximum parameters: 2

## Examples

```
LastDay([Invoice Date], "month")
```

Extracts the month component and returns the last date and time for that month.

```
LastDay(Date("2020-01-10 10:34:29"), "year")
```

Returns the last date and time for the year of the given date.