---
title: date.sub() function
description: >
  `date.sub()` subtracts a duration from a time value and returns the resulting time value.
menu:
  flux_v0_ref:
    name: date.sub
    parent: date
    identifier: date/sub
weight: 101
flux/v0/tags: [date/time]
introduced: 0.162.0
---

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`date.sub()` subtracts a duration from a time value and returns the resulting time value.



##### Function type signature

```js
(d: duration, from: A, ?location: {zone: string, offset: duration}) => time where A: Timeable
```

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

## Parameters

### from
({{< req >}})
Time to subtract the duration from.

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

### d
({{< req >}})
Duration to subtract.



### location

Location to use for the time value.




## Examples

- [Subtract six hours from a timestamp](#subtract-six-hours-from-a-timestamp)
- [Subtract six hours from a relative duration](#subtract-six-hours-from-a-relative-duration)
- [Subtract two days from one hour ago](#subtract-two-days-from-one-hour-ago)

### Subtract six hours from a timestamp

```js
import "date"

date.sub(from: 2019-09-16T12:00:00Z, d: 6h)// Returns 2019-09-16T06:00:00.000000000Z


```


### Subtract six hours from a relative duration

```js
import "date"

option now = () => 2022-01-01T12:00:00Z

date.sub(d: 6h, from: -3h)// Returns 2022-01-01T03:00:00.000000000Z


```


### Subtract two days from one hour ago

A time may be represented as either an explicit timestamp
or as a relative time from the current `now` time. sub can
support either type of value.

```js
import "date"

option now = () => 2021-12-10T16:27:40Z

date.sub(from: -1h, d: 2d)// Returns 2021-12-08T15:27:40Z


```