# week_start_day

<br />

## Usage

```
week_start_day: monday
```

|---|---|
| Hierarchy [Model File](https://docs.cloud.google.com/looker/docs/reference/param-model) `week_start_day` | Default Value `monday` <br /> Accepts A day of the week (`monday`, `tuesday`, `wednesday`, `thursday`, `friday`, `saturday`, or `sunday`) |

## Definition

You can adjust the day that Looker considers to be the start of a week with the `week_start_day` parameter. Using `week_start_day` affects:

- The way that data appears in your tables
- The sort order of the tables
- The operation of filters

The `week_start_day` parameter works with three of the four week-related [`timeframes`](https://docs.cloud.google.com/looker/docs/reference/param-field-dimension-group#timeframes):

| timeframe | Works with `week_start_day`? |
|---|---|
| `day_of_week_index` | Yes |
| `week` | Yes |
| `day_of_week` | Yes |
| `week_of_year` | No |

`week_start_day` does not work with `week_of_year` because that timeframe is based on the ISO standard, which uses Monday weeks.

## Examples

Adjust weeks to start on Sunday instead of Monday:

    week_start_day: sunday