---
title: timeShift() function
description: >
  `timeShift()` adds a fixed duration to time columns.
menu:
  flux_v0_ref:
    name: timeShift
    parent: universe
    identifier: universe/timeShift
weight: 101
flux/v0/tags: [transformations, date/time]
introduced: 0.7.0
---

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`timeShift()` adds a fixed duration to time columns.

The output table schema is the same as the input table schema.
`null` time values remain `null`.

##### Function type signature

```js
(<-tables: stream[A], duration: duration, ?columns: [string]) => stream[A]
```

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

## Parameters

### duration
({{< req >}})
Amount of time to add to each time value. May be a negative duration.



### columns

List of time columns to operate on. Default is `["_start", "_stop", "_time"]`.



### tables

Input data. Default is piped-forward data (`<-`).




## Examples

- [Shift timestamps forward in time](#shift-timestamps-forward-in-time)
- [Shift timestamps backward in time](#shift-timestamps-backward-in-time)

### Shift timestamps forward in time

```js
import "sampledata"

sampledata.int()
    |> timeShift(duration: 12h)

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:10Z | 10      | t1   |
| 2021-01-01T00:00:20Z | 7       | t1   |
| 2021-01-01T00:00:30Z | 17      | t1   |
| 2021-01-01T00:00:40Z | 15      | t1   |
| 2021-01-01T00:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 19      | t2   |
| 2021-01-01T00:00:10Z | 4       | t2   |
| 2021-01-01T00:00:20Z | -3      | t2   |
| 2021-01-01T00:00:30Z | 19      | t2   |
| 2021-01-01T00:00:40Z | 13      | t2   |
| 2021-01-01T00:00:50Z | 1       | t2   |


#### Output data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T12:00:00Z | -2      | t1   |
| 2021-01-01T12:00:10Z | 10      | t1   |
| 2021-01-01T12:00:20Z | 7       | t1   |
| 2021-01-01T12:00:30Z | 17      | t1   |
| 2021-01-01T12:00:40Z | 15      | t1   |
| 2021-01-01T12:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T12:00:00Z | 19      | t2   |
| 2021-01-01T12:00:10Z | 4       | t2   |
| 2021-01-01T12:00:20Z | -3      | t2   |
| 2021-01-01T12:00:30Z | 19      | t2   |
| 2021-01-01T12:00:40Z | 13      | t2   |
| 2021-01-01T12:00:50Z | 1       | t2   |

{{% /expand %}}
{{< /expand-wrapper >}}

### Shift timestamps backward in time

```js
import "sampledata"

sampledata.int()
    |> timeShift(duration: -12h)

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:10Z | 10      | t1   |
| 2021-01-01T00:00:20Z | 7       | t1   |
| 2021-01-01T00:00:30Z | 17      | t1   |
| 2021-01-01T00:00:40Z | 15      | t1   |
| 2021-01-01T00:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 19      | t2   |
| 2021-01-01T00:00:10Z | 4       | t2   |
| 2021-01-01T00:00:20Z | -3      | t2   |
| 2021-01-01T00:00:30Z | 19      | t2   |
| 2021-01-01T00:00:40Z | 13      | t2   |
| 2021-01-01T00:00:50Z | 1       | t2   |


#### Output data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2020-12-31T12:00:00Z | -2      | t1   |
| 2020-12-31T12:00:10Z | 10      | t1   |
| 2020-12-31T12:00:20Z | 7       | t1   |
| 2020-12-31T12:00:30Z | 17      | t1   |
| 2020-12-31T12:00:40Z | 15      | t1   |
| 2020-12-31T12:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2020-12-31T12:00:00Z | 19      | t2   |
| 2020-12-31T12:00:10Z | 4       | t2   |
| 2020-12-31T12:00:20Z | -3      | t2   |
| 2020-12-31T12:00:30Z | 19      | t2   |
| 2020-12-31T12:00:40Z | 13      | t2   |
| 2020-12-31T12:00:50Z | 1       | t2   |

{{% /expand %}}
{{< /expand-wrapper >}}