## Syntax
```mermaid
%%{init: {
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'themeVariables': {
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flowchart LR
Start((START)) --> DAYOFWEEK[DAYOFWEEK]:::quoted
DAYOFWEEK --> End((END))
```
## Purpose
The `DAYOFWEEK` SQL function collects the day of a week from a date. Day numbering starts at 0 for Sunday and ends at 6 for Saturday.
Parameters:
- Input (`datetime`): the date/time.
Returns: the day of a week as as `int32`.
## Examples
The following example retrieves the day number within a week of a date:
```sql
select dayofweek(to_date('20260603', 'YYYYMMDD'))
-------------------
3
```
The following example retrieves the day number within a week of a date:
```sql
select dayofweek(to_date('20260531', 'YYYYMMDD'))
-------------------
0
```