---
title: promql.promqlHour() function
description: promql.promqlHour() implements functionality equivalent to PromQL’s hour() function.
url: https://docs.influxdata.com/flux/v0/stdlib/internal/promql/promqlhour/
estimated_tokens: 310
product: Flux
version: v0
---

# promql.promqlHour() function

-   Flux 0.47.0+
-   View InfluxDB support

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

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

##### Function type signature

```js
(timestamp: float) => float
```

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

## Parameters

### timestamp

(Required) Time as a floating point value.