---
title: date.week() function
description: >
  `date.week()` returns the ISO week of the year for a specified time.
  Results range from `[1 - 53]`.
menu:
  flux_0_x_ref:
    name: date.week
    parent: date
    identifier: date/week
weight: 101
---

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`date.week()` returns the ISO week of the year for a specified time.
Results range from `[1 - 53]`.



##### Function type signature

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

{{% caption %}}For more information, see [Function type signatures](/flux/v0.x/function-type-signatures/).{{% /caption %}}

## Parameters

### t
({{< req >}})
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 week of the year](#return-the-week-of-the-year)
- [Return the week of the year using a relative duration](#return-the-week-of-the-year-using-a-relative-duration)

### Return the week of the year

```js
import "date"

date.week(t: 2020-02-11T12:21:03.29353494Z)// Returns 7


```


### Return the week of the year using a relative duration

```js
import "date"

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

date.week(t: -12d)// Returns 42


```