---
title: promql.timestamp() function
description: >
  `promql.timestamp()` implements functionality equivalent to
  [PromQL's `timestamp()` function](https://prometheus.io/docs/prometheus/latest/querying/functions/#timestamp).
menu:
  flux_v0_ref:
    name: promql.timestamp
    parent: internal/promql
    identifier: internal/promql/timestamp
weight: 201
---

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`promql.timestamp()` implements functionality equivalent to
[PromQL's `timestamp()` function](https://prometheus.io/docs/prometheus/latest/querying/functions/#timestamp).

**Important**: The `internal/promql` package is not meant for external use.

##### Function type signature

```js
(<-tables: stream[{A with _value: float}]) => stream[{A with _value: float}]
```

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

## Parameters

### tables

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




## Examples

### Convert timestamps into seconds since the Unix epoch

```js
import "internal/promql"
import "sampledata"

sampledata.float()
    |> promql.timestamp()

```

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

#### Input data

| _time                | *tag | _value  |
| -------------------- | ---- | ------- |
| 2021-01-01T00:00:00Z | t1   | -2.18   |
| 2021-01-01T00:00:10Z | t1   | 10.92   |
| 2021-01-01T00:00:20Z | t1   | 7.35    |
| 2021-01-01T00:00:30Z | t1   | 17.53   |
| 2021-01-01T00:00:40Z | t1   | 15.23   |
| 2021-01-01T00:00:50Z | t1   | 4.43    |

| _time                | *tag | _value  |
| -------------------- | ---- | ------- |
| 2021-01-01T00:00:00Z | t2   | 19.85   |
| 2021-01-01T00:00:10Z | t2   | 4.97    |
| 2021-01-01T00:00:20Z | t2   | -3.75   |
| 2021-01-01T00:00:30Z | t2   | 19.77   |
| 2021-01-01T00:00:40Z | t2   | 13.86   |
| 2021-01-01T00:00:50Z | t2   | 1.86    |


#### Output data

| _time                | *tag | _value     |
| -------------------- | ---- | ---------- |
| 2021-01-01T00:00:00Z | t1   | 1609459200 |
| 2021-01-01T00:00:10Z | t1   | 1609459210 |
| 2021-01-01T00:00:20Z | t1   | 1609459220 |
| 2021-01-01T00:00:30Z | t1   | 1609459230 |
| 2021-01-01T00:00:40Z | t1   | 1609459240 |
| 2021-01-01T00:00:50Z | t1   | 1609459250 |

| _time                | *tag | _value     |
| -------------------- | ---- | ---------- |
| 2021-01-01T00:00:00Z | t2   | 1609459200 |
| 2021-01-01T00:00:10Z | t2   | 1609459210 |
| 2021-01-01T00:00:20Z | t2   | 1609459220 |
| 2021-01-01T00:00:30Z | t2   | 1609459230 |
| 2021-01-01T00:00:40Z | t2   | 1609459240 |
| 2021-01-01T00:00:50Z | t2   | 1609459250 |

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