131 lines
3.5 KiB
Markdown
131 lines
3.5 KiB
Markdown
---
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title: timeShift() function
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description: The `timeShift()` function adds a fixed duration to time columns.
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aliases:
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- /influxdb/v2.0/reference/flux/functions/transformations/shift
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- /influxdb/v2.0/reference/flux/functions/built-in/transformations/shift
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- /influxdb/v2.0/reference/flux/functions/built-in/transformations/timeshift/
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- /influxdb/v2.0/reference/flux/stdlib/built-in/transformations/timeshift/
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- /influxdb/cloud/reference/flux/stdlib/built-in/transformations/timeshift/
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menu:
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flux_0_x_ref:
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name: timeShift
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parent: universe
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weight: 102
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flux/v0.x/tags: [transformations, date/time]
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introduced: 0.7.0
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---
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The `timeShift()` function adds a fixed duration to time columns.
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The output table schema is the same as the input table.
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If the time is `null`, the time will continue to be `null`.
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```js
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timeShift(duration: 10h, columns: ["_start", "_stop", "_time"])
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```
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## Parameters
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### duration {data-type="duration"}
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({{< req >}})
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The amount of time to add to each time value.
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May be a negative duration.
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### columns {data-type="array of strings"}
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The list of all columns to be shifted.
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Default is `["_start", "_stop", "_time"]`.
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### tables {data-type="stream of tables"}
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Input data.
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Default is piped-forward data ([`<-`](/flux/v0.x/spec/expressions/#pipe-expressions)).
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## Examples
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{{% flux/sample-example-intro plural=true %}}
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- [Shift timestamps forward in time](#shift-timestamps-forward-in-time)
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- [Shift timestamps backward in time](#shift-timestamps-backward-in-time)
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#### Shift timestamps forward in time
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```js
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import "sampledata"
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sampledata.int()
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|> timeShift(duration: 12h)
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```
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{{< expand-wrapper >}}
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{{% expand "View input and output" %}}
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{{< flex >}}
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{{% flex-content %}}
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##### Input data
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{{% flux/sample "int" %}}
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{{% /flex-content %}}
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{{% flex-content %}}
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##### Output data
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| _time | tag | _value |
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| :------------------- | :-- | -----: |
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| 2021-01-01T12:00:00Z | t1 | -2 |
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| 2021-01-01T12:00:10Z | t1 | 10 |
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| 2021-01-01T12:00:20Z | t1 | 7 |
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| 2021-01-01T12:00:30Z | t1 | 17 |
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| 2021-01-01T12:00:40Z | t1 | 15 |
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| 2021-01-01T12:00:50Z | t1 | 4 |
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| _time | tag | _value |
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| :------------------- | :-- | -----: |
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| 2021-01-01T12:00:00Z | t2 | 19 |
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| 2021-01-01T12:00:10Z | t2 | 4 |
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| 2021-01-01T12:00:20Z | t2 | -3 |
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| 2021-01-01T12:00:30Z | t2 | 19 |
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| 2021-01-01T12:00:40Z | t2 | 13 |
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| 2021-01-01T12:00:50Z | t2 | 1 |
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{{% /flex-content %}}
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{{< /flex >}}
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{{% /expand %}}
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{{< /expand-wrapper >}}
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#### Shift timestamps backward in time
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```js
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import "sampledata"
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sampledata.int()
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|> timeShift(duration: -12h)
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```
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{{< expand-wrapper >}}
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{{% expand "View input and output" %}}
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{{< flex >}}
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{{% flex-content %}}
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##### Input data
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{{% flux/sample "int" %}}
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{{% /flex-content %}}
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{{% flex-content %}}
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##### Output data
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| _time | tag | _value |
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| :------------------- | :-- | -----: |
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| 2020-12-31T12:00:00Z | t1 | -2 |
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| 2020-12-31T12:00:10Z | t1 | 10 |
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| 2020-12-31T12:00:20Z | t1 | 7 |
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| 2020-12-31T12:00:30Z | t1 | 17 |
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| 2020-12-31T12:00:40Z | t1 | 15 |
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| 2020-12-31T12:00:50Z | t1 | 4 |
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| _time | tag | _value |
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| :------------------- | :-- | -----: |
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| 2020-12-31T12:00:00Z | t2 | 19 |
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| 2020-12-31T12:00:10Z | t2 | 4 |
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| 2020-12-31T12:00:20Z | t2 | -3 |
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| 2020-12-31T12:00:30Z | t2 | 19 |
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| 2020-12-31T12:00:40Z | t2 | 13 |
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| 2020-12-31T12:00:50Z | t2 | 1 |
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{{% /flex-content %}}
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{{< /flex >}}
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{{% /expand %}}
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{{< /expand-wrapper >}}
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