## Syntax
```mermaid
%%{init: {
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'themeVariables': {
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flowchart LR
Start((START)) --> DAYOFYEAR[DAYOFYEAR]:::quoted
DAYOFYEAR --> End((END))
```
## Purpose
The `DAYOFYEAR` SQL function collects the day of a year from a date. Day numbering starts at 1 for January 1.
Parameters:
- Input (`datetime`): the date/time.
Returns: the day of the year as as `int32`.
## Examples
The following example retrieves the day number within a week of a date:
```sql
select dayofyear(to_date('20260101', 'YYYYMMDD'))
-------------------
1
```
The following example retrieves the day number within a week of a date:
```sql
select dayofyear(to_date('20260101', 'YYYYMMDD'))
-------------------
365
```