Swift 日期处理库 SwiftDate

Posted 2021-04-28 swift语言

SwiftDate是Github上开源的，使用Swift语言编写的NSDate封装库，可以很方便的在Swift中处理日期，比如日期创建，比较，输出等。 

特性 

• 支持数学运算符进行日期计算（比如myDate + 2.week + 1.hour) 

• 支持比较运算符（比如<,>,==,<=,>=） 

• 快速获取/修改日期各部分内容（比如获取或修改日期中的月份） 

• 提供通用格式化输出或自定义的格式化输出 

• 提供一系列.toString方法 

• 提供简便的方法获取yesterday,tomorrow等 

创建日期 

• 通过解析字符串创建 

1	letdate_custom = NSDate.date(fromString: "2015-07-26", format: DateFormat.Custom("YYYY-MM-DD"))

• 通过指定日期各部分创建 

1	letdate_from_components = NSDate.date(refDate: nil, year: 2014, month: 01, day: nil, hour: nil, minute: nil, second: nil, tz: "UTC")

• 通过String类的toDate方法创建 

1	let date = "2015-07-26".toDate(formatString: "YYYY-MM-DD")

• 通过NSDate的静态方法创建 

1	let todayDate = NSDate.today()

2	let yesterdayDate = NSDate.yesterday()

3	let tomorrowDate = NSDate.tomorrow()

获取日期中年月日等信息 

我们可以通过NSDate的以下属性获取 

01

.year

02

.month

03	.weekOfMonth

04

.weekday

05	.weekdayOrdinal

06

.day

07

.hour

08

.minute

09

.second

10

.era

11	.firstDayOfWeek // (first day of the week of passed date)

12	.lastDayOfWeek // (last day of the week of passed date)

13	.nearestHour // (nearest hour of the passed date)

14	.isLeapYear() // true if date's represented year is leap

15	.monthDays() // return the number of days in date's represented month

修改日期 

1	var date = NSDate()

2	date = date.set("hour",value: 12)!

3	date = date.set("day",value: 1)!

日期运算 

1	let date = NSDate()

2	let tomorrow = date+1.day

3	let two_months_ago = date-2.months

时区转换 

1	let date = NSDate() //本地时区

2	let date_as_utc = date.toUTC() //UTC 时间

3	let date_as_beijing = date_as_utc.toTimezone("UTC+8") //北京时间

日期比较 

我们可以通过数学运算符比较 

1	letdate1 = NSDate.date(fromString: "2015-07-26", format: DateFormat.Custom("YYYY-MM-DD"))

2	letdate2 = NSDate.date(fromString: "2015-07-27", format: DateFormat.Custom("YYYY-MM-DD"))

3

4	if date2 > date1 {

5

6	// TODO something

7

8

}

还可以通过NSDate的以下一些方法来比较

01	let isInRange : Bool = date1.isInTimeRange("11:00","15:00")

02

03	.isToday()  // true if represented date is today

04	.isTomorrow()

05	.isYesterday()

06	.isThisWeek() // true if represented date's week is the current week

07	.isSameWeekOf(date: NSDate) // true if two dates share the same year's week

08	.dateAtWeekStart() // return the date where current's date week starts

09	.beginningOfDay() // return the same date of the sender with time set to 00:00:00

10	.endOfDay() // return the same date of the sender with time set to 23:59:59

11	.beginningOfMonth() // return the date which represent the first day of the sender date's month

12	.endOfMonth() // return the date which represent the last day of the sender date's month

13	.beginningOfYear() // return the date which represent the first day of the sender date's year

14	.endOfYear() // return the date which represent the last day of the sender date's year

15	.isWeekday() // true if current sender date is a week day

16	.isWeekend() // true if current sender date is a weekend day (sat/sun)

NSDate转换为字符串 

1	let string = date.toString(format: DateFormat.Custom("YYYY-MM-DD"))

也可以在转换方法中指定NSDateFormatterStyle

1	letstring = date.toString(dateStyle: .ShortStyle timeStyle:.LongStyle relativeDate:true)

还可以通过以下方法转换为特定的字符串

01	.toISOString() //  DateFormat.ISO8601

02	.toShortString() // short style, both time and date are printed

03	.toMediumString() // medium style, both time and date are printed

04	.toLongString() // full style, both time and date are printed

05	.toShortDateString() // short style, print only date

06	.toShortTimeString() // short style, print only time

07	.toMediumDateString() // medium style, print only date

08	.toMediumTimeString() // medium style, print only time

09	.toLongDateString() // long style, print only date

10	.toLongTimeString() // long style, print only time

最后我们还可以输出相对时间的格式，比如输出”2 hours ago”

1	var d = NSDate()-2.hour

2	var abb = d.toRelativeString(abbreviated: true, maxUnits: 3)

3	println("data: \(abb)")

开源代码主页：https://github.com/malcommac/SwiftDate

文章来自：51swift