---
title: Work with durations
description: A duration type represents a length of time with nanosecond precision Learn how to work with duration data types in Flux.
url: https://docs.influxdata.com/flux/v0/data-types/basic/duration/
estimated_tokens: 2958
product: Flux
version: v0
---

# Work with durations

A **duration** type represents a length of time with nanosecond precision.

**Type name**: `duration`

-   [Duration syntax](#duration-syntax)
-   [Convert data types to durations](#convert-data-types-to-durations)
-   [Operate on durations](#operate-on-durations)

## Duration syntax

Duration literals contain integers and unit specifiers. Flux supports the following unit specifiers:

-   `ns`: nanosecond
-   `us`: microsecond
-   `ms`: millisecond
-   `s`: second
-   `m`: minute
-   `h`: hour
-   `d`: day
-   `w`: week
-   `mo`: calendar month
-   `y`: calendar year

```js
1ns // 1 nanosecond
1us // 1 microsecond
1ms // 1 millisecond
1s  // 1 second
1m  // 1 minute
1h  // 1 hour
1d  // 1 day
1w  // 1 week
1mo // 1 calendar month
1y  // 1 calendar year

3d12h4m25s // 3 days, 12 hours, 4 minutes, and 25 seconds

```

#### Do not include leading zeros in duration literals

The integer part of a duration literal should not contain leading zeros. Leading zeros are parsed as separate integer literals. For example:

```js
01m // parsed as 0 (integer literal) and 1m (duration literal)
02h05m // parsed as 0 (integer literal), 2h (duration literal), 0 (integer literal), and 5m (duration literal)

```

## Convert data types to durations

Use the [`duration()` function](/flux/v0/stdlib/universe/duration/) to convert the following [basic types](/flux/v0/data-types/basic/) to durations:

-   **string**: parsed as a duration string and converted to a duration.
-   **int**: parsed as nanoseconds and converted to a duration.
-   **uint**: parsed as nanoseconds and converted to a duration.

```js
duration(v: "1h30m")
// Returns 1h30m

duration(v: 1000000)
// Returns 1ms

duration(v: uint(v: 3000000000))
// Returns 3s

```

**Flux does not support duration columns.**

## Operate on durations

-   [Perform arithmetic operations on durations](#perform-arithmetic-operations-on-durations)
-   [Add a duration to a time value](#add-a-duration-to-a-time-value)
-   [Subtract a duration from a time value](#subtract-a-duration-from-a-time-value)

### Perform arithmetic operations on durations

To perform operations like adding, subtracting, multiplying, or dividing duration values:

1. Use [`int()`](/flux/v0/stdlib/universe/int/) or [`uint()`](/flux/v0/stdlib/universe/uint/) to convert duration values to numeric values.
2. Use [arithmetic operators](/flux/v0/spec/operators/#arithmetic-operators) to operate on numeric values.
3. Use [`duration()`](/flux/v0/stdlib/universe/duration/) to convert the calculated numeric value into a duration.

```js
duration(v: int(v: 6h4m) + int(v: 22h32s))
// Returns 1d4h4m32s

duration(v: int(v: 22h32s) - int(v: 6h4m))
// Returns 15h56m32s

duration(v: int(v: 32m10s) * 10)
// Returns 5h21m40s

duration(v: int(v: 24h) / 2)
// Returns 12h

```

### Add a duration to a time value

1. Import the [`date` package](/flux/v0/stdlib/date/).
2. Use [`date.add()`](/flux/v0/stdlib/date/add/) to add a duration to a time value.

```js
import "date"

date.add(d: 1w, to: 2021-01-01T00:00:00Z)
// Returns 2021-01-08T00:00:00.000000000Z

```

### Subtract a duration from a time value

1. Import the [`date` package](/flux/v0/stdlib/date/).
2. Use [`date.sub()`](/flux/v0/stdlib/date/sub/) to subtract a duration from a time value.

```js
import "date"

date.sub(d: 1w, from: 2021-01-01T00:00:00Z)
// Returns 2020-12-25T00:00:00.000000000Z

```

#### Related

-   [duration() function](/flux/v0/stdlib/universe/duration/)

[basic types](/flux/v0/tags/basic-types/) [data types](/flux/v0/tags/data-types/)