---
title: Date.FormatStyle.Symbol.DayOfYear
framework: foundation
role: symbol
role_heading: Structure
path: foundation/date/formatstyle/symbol/dayofyear
---

# Date.FormatStyle.Symbol.DayOfYear

A type that specifies the format for the day of the year in a date format style.

## Declaration

```swift
struct DayOfYear
```

## Overview

Overview The type Date.FormatStyle.Symbol.DayOfYear includes static factory variables that create custom Date.FormatStyle.Symbol.DayOfYear objects:  |   |   |   |  To customize the day format in a string representation of a Date, use dayOfYear(_:). The following example shows a variety of Date.FormatStyle.Symbol.DayOfYear formats applied to a date. let meetingDate = Date() // Feb 9, 2021 at 3:00 PM meetingDate.formatted(Date.FormatStyle().dayOfYear(.defaultDigits)) // 40 meetingDate.formatted(Date.FormatStyle().dayOfYear(.twoDigits)) // 40 meetingDate.formatted(Date.FormatStyle().dayOfYear(.threeDigits)) // 040 meetingDate.formatted(Date.FormatStyle().dayOfYear()) // 40

If no format is specified as a parameter, the defaultDigits static variable is the default format. For more information about formatting dates, see the Date.FormatStyle.

## Topics

### Modifying a Day of Year Value

- [defaultDigits](foundation/date/formatstyle/symbol/dayofyear/defaultdigits.md)
- [threeDigits](foundation/date/formatstyle/symbol/dayofyear/threedigits.md)
- [twoDigits](foundation/date/formatstyle/symbol/dayofyear/twodigits.md)

### Comparing Day of Year Values

- [==(_:_:)](foundation/date/==(_:_:).md)

### Type Properties

- [omitted](foundation/date/formatstyle/symbol/dayofyear/omitted.md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Modifying Date Style Format Symbols

- [Date.FormatStyle.Symbol.CyclicYear](foundation/date/formatstyle/symbol/cyclicyear.md)
- [Date.FormatStyle.Symbol.Day](foundation/date/formatstyle/symbol/day.md)
- [Date.FormatStyle.Symbol.DayPeriod](foundation/date/formatstyle/symbol/dayperiod.md)
- [Date.FormatStyle.Symbol.Era](foundation/date/formatstyle/symbol/era.md)
- [Date.FormatStyle.Symbol.Hour](foundation/date/formatstyle/symbol/hour.md)
- [Date.FormatStyle.Symbol.Minute](foundation/date/formatstyle/symbol/minute.md)
- [Date.FormatStyle.Symbol.Month](foundation/date/formatstyle/symbol/month.md)
- [Date.FormatStyle.Symbol.Quarter](foundation/date/formatstyle/symbol/quarter.md)
- [Date.FormatStyle.Symbol.Second](foundation/date/formatstyle/symbol/second.md)
- [Date.FormatStyle.Symbol.SecondFraction](foundation/date/formatstyle/symbol/secondfraction.md)
- [Date.FormatStyle.Symbol.StandaloneMonth](foundation/date/formatstyle/symbol/standalonemonth.md)
- [Date.FormatStyle.Symbol.StandaloneQuarter](foundation/date/formatstyle/symbol/standalonequarter.md)
- [Date.FormatStyle.Symbol.StandaloneWeekday](foundation/date/formatstyle/symbol/standaloneweekday.md)
- [Date.FormatStyle.Symbol.TimeZone](foundation/date/formatstyle/symbol/timezone.md)
- [Date.FormatStyle.Symbol.VerbatimHour](foundation/date/formatstyle/symbol/verbatimhour.md)