squiggle/packages/website/docs/Api/Duration.mdx

---
sidebar_position: 6
title: Duration
---

Duration works with the [Date](/docs/Api/Date) type. Similar to the Date implementation, the Duration functions are early and experimental. There is no support yet for date or duration probability distributions.

Durations are stored in Unix milliseconds.

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### toString

```
toString: (duration) => string
```

## Units

### minutes

```
minutes: (number) => duration
```

### hours

```
hours: (number) => duration
```

### days

```
days: (number) => duration
```

### years

```
years: (number) => duration
```

### toHours

```
toHours: (duration) => number
```

### toMinutes

```
toMinutes: (duration) => number
```

### toDays

```
toDays: (duration) => number
```

### toYears

```
toYears: (duration) => number
```

## Algebra

### add

```
add: (duration, duration) => duration
```

### subtract

```
subtract: (duration, duration) => duration
```

### multiply

```
multiply: (duration, number) => duration
```

### divide

```
divide: (duration, number) => duration
```