---
title: promql.promqlDaysInMonth() function
description: promql.promqlDaysInMonth() implements functionality equivalent to PromQL’s days_in_month() function.
url: https://docs.influxdata.com/flux/v0/stdlib/internal/promql/promqldaysinmonth/
estimated_tokens: 134
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/internal/promql/promqldaysinmonth/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.47.0+

InfluxDB support

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

**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.