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# timeZone(separator:)

Modifies the ISO 8601 date format style to include the time zone in the formatted output.

```
func timeZone(separator: Date.ISO8601FormatStyle.TimeZoneSeparator) -> Date.ISO8601FormatStyle
```

## Parameters

`separator`

Character used to separate the time and time zone in a date.

## Return Value

An ISO 8601 date format style modified to include the time zone.

## Discussion

The default [`Date.ISO8601FormatStyle`](/documentation/Foundation/Date/ISO8601FormatStyle) doesn’t include the time zone.

For more information about formatting dates, see the [`Date.FormatStyle`](/documentation/Foundation/Date/FormatStyle).

---

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