swift 对日期的处理大全（ 类扩展 Date+Extension 和 公共类 DateClass）

类扩展 Date+Extension

import UIKit

extension Date {
//MARK: - 获取日期各种值
//MARK: 年
func year() ->Int {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: self)
return com.year!
}
//MARK: 月
func month() ->Int {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: self)
return com.month!

}
//MARK: 日
func day() ->Int {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: self)
return com.day!

}
//MARK: 星期几
func weekDay()->Int{
let interval = Int(self.timeIntervalSince1970)
let days = Int(interval/86400) // 24*60*60
let weekday = ((days + 4)%7+7)%7
return weekday == 0 ? 7 : weekday
}
//MARK: 当月天数
func countOfDaysInMonth() ->Int {
let calendar = Calendar(identifier:Calendar.Identifier.gregorian)
let range = (calendar as NSCalendar?)?.range(of: NSCalendar.Unit.day, in: NSCalendar.Unit.month, for: self)
return (range?.length)!

}
//MARK: 当月第一天是星期几
func firstWeekDay() ->Int {
//1.Sun. 2.Mon. 3.Thes. 4.Wed. 5.Thur. 6.Fri. 7.Sat.
let calendar = Calendar(identifier:Calendar.Identifier.gregorian)
let firstWeekDay = (calendar as NSCalendar?)?.ordinality(of: NSCalendar.Unit.weekday, in: NSCalendar.Unit.weekOfMonth, for: self)
return firstWeekDay! - 1

}
//MARK: - 日期的一些比较
//是否是今天
func isToday()->Bool {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: self)
let comNow = calendar.dateComponents([.year,.month,.day], from: Date())
return com.year == comNow.year && com.month == comNow.month && com.day == comNow.day
}
//是否是这个月
func isThisMonth()->Bool {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: self)
let comNow = calendar.dateComponents([.year,.month,.day], from: Date())
return com.year == comNow.year && com.month == comNow.month
}
}

import UIKit

class DateClass {
//MARK: - 当前时间相关
//MARK: 今年
static func currentYear() ->Int {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: Date())
return com.year!
}
//MARK: 今月
static func currentMonth() ->Int {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: Date())
return com.month!

}
//MARK: 今日
static func currentDay() ->Int {
let calendar = NSCalendar.current
let com = calendar.dateComponents([.year,.month,.day], from: Date())
return com.day!

}
//MARK: 今天星期几
static func currentWeekDay()->Int{
let interval = Int(Date().timeIntervalSince1970)
let days = Int(interval/86400) // 24*60*60
let weekday = ((days + 4)%7+7)%7
return weekday == 0 ? 7 : weekday
}
//MARK: 本月天数
static func countOfDaysInCurrentMonth() ->Int {
let calendar = Calendar(identifier:Calendar.Identifier.gregorian)
let range = (calendar as NSCalendar?)?.range(of: NSCalendar.Unit.day, in: NSCalendar.Unit.month, for: Date())
return (range?.length)!

}
//MARK: 当月第一天是星期几
static func firstWeekDayInCurrentMonth() ->Int {
//星期和数字一一对应 星期日：7
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM"
let date = dateFormatter.date(from: String(Date().year())+"-"+String(Date().month()))
let calender = Calendar(identifier:Calendar.Identifier.gregorian)
let comps = (calender as NSCalendar?)?.components(NSCalendar.Unit.weekday, from: date!)
var week = comps?.weekday
if week == 1 {
week = 8
}
return week! - 1
}
//MARK: - 获取指定日期各种值
//根据年月得到某月天数
static func getCountOfDaysInMonth(year:Int,month:Int) ->Int{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM"
let date
= dateFormatter.date(from: String(year)+"-"+String(month))
let calendar = Calendar(identifier:Calendar.Identifier.gregorian)
let range = (calendar as NSCalendar?)?.range(of: NSCalendar.Unit.day, in: NSCalendar.Unit.month, for: date!)
return (range?.length)!
}
//MARK: 根据年月得到某月第一天是周几
static func getfirstWeekDayInMonth(year:Int,month:Int) -> Int{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM"
let date
= dateFormatter.date(from: String(year)+"-"+String(month))
let calendar = Calendar(identifier:Calendar.Identifier.gregorian)
let comps = (calendar as NSCalendar?)?.components(NSCalendar.Unit.weekday, from: date!)
let week = comps?.weekday
return week! - 1
}

//MARK: date转日期字符串
static func dateToDateString(_ date:Date, dateFormat:String) -> String {
let timeZone = NSTimeZone.local
let formatter = DateFormatter()
formatter.timeZone = timeZone
formatter.dateFormat = dateFormat

let date = formatter.string(from: date)
return date
}

//MARK: 日期字符串转date
static func dateStringToDate(_ dateStr:String) ->Date {
let dateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
dateFormatter.dateFormat = "yyyy-MM-dd"
let date
= dateFormatter.date(from: dateStr)
return date!
}
//MARK: 时间字符串转date
static func timeStringToDate(_ dateStr:String) ->Date {
let dateFormatter = DateFormatter()
//        dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
dateFormatter.dateFormat = "yyyy-MM-dd  HH:mm:ss"
let date
= dateFormatter.date(from: dateStr)
return date!
}

//MARK: 计算天数差
static func dateDifference(_ dateA:Date, from dateB:Date) -> Double {
let interval = dateA.timeIntervalSince(dateB)
return interval/86400

}

//MARK: 比较时间先后
static func compareOneDay(oneDay:Date, withAnotherDay anotherDay:Date) -> Int {
let dateFormatter:DateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let oneDayStr:String = dateFormatter.string(from: oneDay)
let anotherDayStr:String = dateFormatter.string(from: anotherDay)
let dateA = dateFormatter.date(from: oneDayStr)
let dateB = dateFormatter.date(from: anotherDayStr)
let result:ComparisonResult = (dateA?.compare(dateB!))!
//Date1  is in the future
if(result == ComparisonResult.orderedDescending ) {
return 1

}
//Date1 is in the past
else if(result == ComparisonResult.orderedAscending) {
return 2

}
//Both dates are the same
else {
return 0
}
}

//MARK: 时间与时间戳之间的转化
//将时间转换为时间戳
static func stringToTimeStamp(_ stringTime:String)->Int {
let dfmatter = DateFormatter()
dfmatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

dfmatter.locale = Locale.current

let date = dfmatter.date(from: stringTime)

let dateStamp:TimeInterval = date!.timeIntervalSince1970

let dateSt:Int = Int(dateStamp)

return dateSt
}
//将时间戳转换为年月日
static func timeStampToString(_ timeStamp:String)->String {
let string = NSString(string: timeStamp)
let timeSta:TimeInterval = string.doubleValue
let dfmatter = DateFormatter()
dfmatter.dateFormat="yyyy年MM月dd日"
let date = Date(timeIntervalSince1970: timeSta)
return dfmatter.string(from: date)
}
//将时间戳转换为具体时间
static func timeStampToStringDetail(_ timeStamp:String)->String {
let string = NSString(string: timeStamp)
let timeSta:TimeInterval = string.doubleValue
let dfmatter = DateFormatter()
dfmatter.dateFormat="yyyy年MM月dd日HH:mm:ss"
let date = Date(timeIntervalSince1970: timeSta)
return dfmatter.string(from: date)
}
//将时间戳转换为时分秒
static func timeStampToHHMMSS(_ timeStamp:String)->String {
let string = NSString(string: timeStamp)
let timeSta:TimeInterval = string.doubleValue
let dfmatter = DateFormatter()
dfmatter.dateFormat="HH:mm:ss"
let date = Date(timeIntervalSince1970: timeSta)
return dfmatter.string(from: date)
}
//获取系统的当前时间戳
static func getStamp()->Int{
//获取当前时间戳
let date = Date()
let timeInterval:Int = Int(date.timeIntervalSince1970)
return timeInterval
}
//月份数字转汉字
static func numberToChina(monthNum:Int) -> String {
let ChinaArray = ["一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"]
let ChinaStr:String = ChinaArray[monthNum - 1]
return ChinaStr

}
//MARK: 数字前补0
static func add0BeforeNumber(_ number:Int) -> String {
if number >= 10 {
return String(number)
}else{
return "0" + String(number)
}
}

//MARK: 将时间显示为（几分钟前，几小时前，几天前）
static func compareCurrentTime(str:String) -> String {

let timeDate = self.timeStringToDate(str)

let currentDate = NSDate()

let timeInterval = currentDate.timeIntervalSince(timeDate)

var temp:Double = 0

var result:String = ""

if timeInterval/60 < 1 {

result = "刚刚"

}else if (timeInterval/60) < 60{

temp = timeInterval/60

result = "\(Int(temp))分钟前"

}else if timeInterval/60/60 < 24 {

temp = timeInterval/60/60

result = "\(Int(temp))小时前"

}else if timeInterval/(24 * 60 * 60) < 30 {

temp = timeInterval / (24 * 60 * 60)

result = "\(Int(temp))天前"

}else if timeInterval/(30 * 24 * 60 * 60)  < 12 {

temp = timeInterval/(30 * 24 * 60 * 60)

result = "\(Int(temp))个月前"

}else{

temp = timeInterval/(12 * 30 * 24 * 60 * 60)

result = "\(Int(temp))年前"

}

return result

}
}

let date = Date()
let zone = NSTimeZone.local
let interval:NSInteger = zone.secondsFromGMT(for: date)
let now = date.addingTimeInterval(TimeInterval(interval))
print(date,now)