---
title: date.yearDay() function
description: date.yearDay() returns the day of the year for a specified time. Results can include leap days and range from [1 - 366].
url: https://docs.influxdata.com/flux/v0/stdlib/date/yearday/
estimated_tokens: 1247
product: Flux
version: v0
---

# date.yearDay() function

-   Flux 0.37.0+
-   View InfluxDB support

`date.yearDay()` returns the day of the year for a specified time. Results can include leap days and range from `[1 - 366]`.

##### Function type signature

```js
(t: A, ?location: {zone: string, offset: duration}) => int where A: Timeable
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### t

(Required) Time to operate on.

Use an absolute time, relative duration, or integer. Durations are relative to `now()`.

### location

Location used to determine timezone. Default is the `location` option.

## Examples

-   [Return the day of the year for a time value](#return-the-day-of-the-year-for-a-time-value)
-   [Return the day of the year for a relative duration](#return-the-day-of-the-year-for-a-relative-duration)
-   [Return the current day of the year](#return-the-current-day-of-the-year)

### Return the day of the year for a time value

```js
import "date"

date.yearDay(t: 2020-02-11T12:21:03.29353494Z)// Returns 42

```

### Return the day of the year for a relative duration

```js
import "date"

option now = () => 2020-02-11T12:21:03.29353494Z

date.yearDay(t: -1mo)// Returns 276

```

### Return the current day of the year

```js
import "date"

date.yearDay(t: now())
```

[date/time](/flux/v0/tags/date/time/)