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DateFormatter with better header docs
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| import Foundation | |
| public extension DateFormatter { | |
| /** | |
| Makes a new DateFormatter with the specified format, calendar and locale. | |
| Characters Example Description | |
| --------------------------------------------------------------------------------------------------------------- | |
| Year | |
| --------------------------------------------------------------------------------------------------------------- | |
| y 2008 Year, no padding. Best used for user-facing localized dates | |
| yy 08 Year, two digits (padding with a zero if necessary) | |
| yyyy 2008 Year, minimum of four digits (padding with zeros if necessary) | |
| --------------------------------------------------------------------------------------------------------------- | |
| Quarter | |
| --------------------------------------------------------------------------------------------------------------- | |
| Q 4 The quarter of the year. Use QQ if you want zero padding. | |
| QQQ Q4 Quarter including "Q" | |
| QQQQ 4th quarter Quarter spelled out | |
| --------------------------------------------------------------------------------------------------------------- | |
| Month | |
| --------------------------------------------------------------------------------------------------------------- | |
| M 12 The numeric month of the year. A single M will use '1' for January. | |
| MM 12 The numeric month of the year. A double M will use '01' for January. | |
| MMM Dec The shorthand name of the month | |
| MMMM December Full name of the month | |
| MMMMM D Narrow name of the month | |
| --------------------------------------------------------------------------------------------------------------- | |
| Day | |
| --------------------------------------------------------------------------------------------------------------- | |
| d 14 The day of the month. A single d will use 1 for January 1st. | |
| dd 14 The day of the month. A double d will use 01 for January 1st. | |
| F 3rd Tuesday in December The day of week in the month | |
| E Tues The day of week in the month | |
| EEEE Tuesday The full name of the day | |
| EEEEE T The narrow day of week | |
| --------------------------------------------------------------------------------------------------------------- | |
| Hour | |
| --------------------------------------------------------------------------------------------------------------- | |
| h 4 The 12-hour hour. | |
| hh 04 The 12-hour hour padding with a zero if there is only 1 digit | |
| H 16 The 24-hour hour. | |
| HH 16 The 24-hour hour padding with a zero if there is only 1 digit. | |
| a PM AM / PM for 12-hour time formats | |
| --------------------------------------------------------------------------------------------------------------- | |
| Minute | |
| --------------------------------------------------------------------------------------------------------------- | |
| m 35 The minute, with no padding for zeroes. | |
| mm 35 The minute with zero padding. | |
| --------------------------------------------------------------------------------------------------------------- | |
| Second | |
| --------------------------------------------------------------------------------------------------------------- | |
| s 8 The seconds, with no padding for zeroes. | |
| ss 08 The seconds with zero padding. | |
| SSS 1234 The milliseconds. | |
| --------------------------------------------------------------------------------------------------------------- | |
| Time Zone | |
| --------------------------------------------------------------------------------------------------------------- | |
| zzz CST The 3 letter name of the time zone. Falls back to GMT-08:00 (hour offset) | |
| if the name is not known. | |
| zzzz Central Standard Time The expanded time zone name, falls back to GMT-08:00 (hour offset) | |
| if name is not known. | |
| ZZZZ CST-06:00 Time zone with abbreviation and offset | |
| Z -0600 RFC 822 GMT format. Can also match a literal Z for Zulu (UTC) time. | |
| ZZZZZ -06:00 ISO 8601 time zone format | |
| Examples: | |
| EEEE, MMM d, yyyy Monday, Dec 10, 2018 | |
| MM/dd/yyyy 12/10/2018 | |
| MM-dd-yyyy HH:mm 12-10-2018 15:47 | |
| MMM d, h:mm a Dec 10, 3:47 PM | |
| MMMM yyyy December 2018 | |
| MMM d, yyyy Dec 10, 2018 | |
| E, d MMM yyyy HH:mm:ss Z Mon, 10 Dec 2018 15:47:27 +0000 | |
| yyyy-MM-dd'T'HH:mm:ssZ 2018-12-10T15:47:27+0000 | |
| dd.MM.yy 10.12.18 | |
| HH:mm:ss.SSS 15:47:27.514 | |
| - Parameters: | |
| - format: The date format to use. See references above | |
| - calendar: The calendar to use for interpreting dates | |
| - locale: The locale to use for interpreting dates | |
| - seealso: | |
| [Inspired by NSDateFormatter.com](https://nsdateformatter.com) | |
| */ | |
| static func with(format: String, calendar: Calendar = .current, locale: Locale = .current) -> DateFormatter { | |
| let formatter = DateFormatter() | |
| formatter.calendar = calendar | |
| formatter.locale = locale | |
| formatter.dateFormat = format | |
| return formatter | |
| } | |
| } |
Example Usage:
let date = Date()
let formatter = DateFormatter.with(format: "MMM yyyy",
calendar: Calendar(identifier: .gregorian),
locale: Locale(identifier: "en_US_POSIX"))
formatter.string(from: date)Outputs:
"Dec 2018"
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FYI, the code is wrapped to a 120 column width.