---
title: elapsed() function
description: >
  `elapsed()` returns the time between subsequent records.
menu:
  flux_v0_ref:
    name: elapsed
    parent: universe
    identifier: universe/elapsed
weight: 101
flux/v0/tags: [transformations]
introduced: 0.36.0
---

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`elapsed()` returns the time between subsequent records.

For each input table, `elapsed()` returns the same table without the first row
(because there is no previous time to derive the elapsed time from) and an
additional column containing the elapsed time.

##### Function type signature

```js
(<-tables: stream[A], ?columnName: string, ?timeColumn: string, ?unit: duration) => stream[B] where A: Record, B: Record
```

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

### unit

Unit of time used in the calculation. Default is `1s`.



### timeColumn

Column to use to compute the elapsed time. Default is `_time`.



### columnName

Column to store elapsed times in. Default is `elapsed`.



### tables

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




## Examples

### Calculate the time between points in seconds

```js
import "sampledata"

sampledata.int()
    |> elapsed(unit: 1s)

```

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#### 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 | elapsed  |
| -------------------- | ------- | ---- | -------- |
| 2021-01-01T00:00:10Z | 10      | t1   | 10       |
| 2021-01-01T00:00:20Z | 7       | t1   | 10       |
| 2021-01-01T00:00:30Z | 17      | t1   | 10       |
| 2021-01-01T00:00:40Z | 15      | t1   | 10       |
| 2021-01-01T00:00:50Z | 4       | t1   | 10       |

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

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