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

DateClass

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

    }
    //MARK: 今日
    static func currentDay() ->Int {
        let calendar = NSCalendar.current
        let com = calendar.dateComponents([.year,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,for: Date())
        return (range?.length)!

    }
    //MARK: 当月第一天是星期几
    static func firstWeekDayInCurrentMonth() ->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,for: Date())
        return firstWeekDay! - 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,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: 获取指定年月的date
    static func getMonthDate(year:Int,month:Int) ->Date {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM"
        let date
            = dateFormatter.date(from: String(year)+"-"+String(month))
        let calendar = Calendar(identifier:Calendar.Identifier.gregorian)
        var com = calendar.dateComponents([.year,from: date!)
        com.month = month
        com.day = 1
        return calendar.date(from: com)!
    }
    //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)->String {
        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 String(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)
        }
    }
}

（编辑：李大同）

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