swift 时间操作类

//
//  JDateUtil.swift
//  Meetr
//
//  Created by yktx on 14/12/4.
//  Copyright (c) 2014年 yktx.com.Yan. All rights reserved.
//

import Foundation

public extension NSDate{

// 现在的 unix 时间戳
var unixNowTime:NSTimeInterval  {return NSDate().timeIntervalSince1970}

// 现在的字符传 格式
var stringNowTime:NSString {return dateToString(NSDate(), dateFormat: nil)}

// 现在的 时间格式
var dateNowTime:NSDate {return NSDate()}

//今天的时间格式
var dateTodayTime:NSDate{return stringToDate(stringTodayTime, dateFormat: "yyyy年MM月dd日")}

//今天的时间戳格式
var unixTodayTime:NSTimeInterval{return dateToUnix(dateTodayTime)}

//今天的字符串格式
var stringTodayTime:NSString{return dateToString(dateNowTime, dateFormat: "yyyy年MM月dd日")}

// 时间戳 转 时间
func unixToDate(unixTime:NSTimeInterval) -> NSDate{

return NSDate(timeIntervalSince1970: unixTime)
}

//  时间 转 时间戳
func dateToUnix(dateTime:NSDate) -> NSTimeInterval{

return dateTime.timeIntervalSince1970
}

//  时间 转 时间戳
func dateToString(dateTime:NSDate,dateFormat:NSString?) -> NSString{

var formatter = NSDateFormatter()   //新建一个时间格式化工具

var dateForma = ""

if(dateFormat == nil){dateForma = "yyyy年MM月dd日 HH:mm"}

formatter.dateFormat = dateFormat == nil ?  dateForma : dateFormat

return formatter.stringFromDate(dateTime)
}

// 时间戳 转 时间字符串
func unixToString(unixTime:NSTimeInterval,dateFormat:NSString?) -> NSString{

var date = unixToDate(unixTime)

var formatter = NSDateFormatter()   //新建一个时间格式化工具

var dateForma = ""

if(dateFormat == nil){dateForma = "yyyy年MM月dd日 HH:mm"}

formatter.dateFormat = dateFormat == nil ?  dateForma : dateFormat

return formatter.stringFromDate(date)

}

// 字符串 转  时间
func stringToDate(stringTime:NSString,dateFormat:NSString?) -> NSDate{

var outputFormatter = NSDateFormatter()

var dateForma = ""

if(dateFormat == nil){dateForma = "yyyy年MM月dd日 HH:mm"}

outputFormatter.dateFormat = dateFormat == nil ?  dateForma : dateFormat

return outputFormatter.dateFromString(stringTime)!
}

// 字符串 转 时间戳
func stringToUnix(stringTime:NSString) -> NSTimeInterval{

return dateToUnix(stringToDate(stringTime, dateFormat: nil))
}

//调整日期
func adjustDate(date:NSDate,intervalDay:NSInteger) -> NSDate{

var datTime = 3600 * 24

var timeSS = intervalDay * datTime

return date.dateByAddingTimeInterval(Double(timeSS))

}

func timeStdate(intiDate:NSDate) ->NSString{//这个方法有错误，希望指正。这是算时间间隔的，但是对于字符串的截取真心不会

var unixStringTime = "\(intiDate.timeIntervalSince1970)"    //把传入的时间转换成时间戳格式

var timeSp = unixStringTime.substringToIndex(advance(unixStringTime.startIndex, 10)) as NSString    //截取前10个字符

var StringTime:NSString?    //设置一个字符串事件类型那个的字段

var nowDate = NSDate()  //获取当前的时间

var seconds = nowDate.timeIntervalSince1970 //获取当前时间的unix时间戳格式

var timeDistance:Double = seconds - timeSp.doubleValue //现在的时间 和 之前的时间  时间差

var aHourTime:Double = 60 * 60 //  每一个小时有多少秒

var time = timeSp.doubleValue   //将字符串转换成时间戳

var detaildate = NSDate(timeIntervalSince1970: time)    //通过时间戳转换为 时间格式

var formatter = NSDateFormatter()   //新建一个时间格式化工具

formatter.dateFormat = "yyyy年MM月dd日 HH:mm"  //设置工具格式化格式

var ayear = formatter.stringFromDate(nowDate)

var year = ayear.substringToIndex(advance(ayear.startIndex, 4))

var current = formatter.stringFromDate(detaildate)

var today = stringTodayTime

var yesterday = adjustDate(dateTodayTime, intervalDay: -1)

var range = NSRange(location: 0,length: 11)

var isYestoday = current.substringToIndex(advance(unixStringTime.startIndex, 11))

if(timeDistance >= aHourTime){

var result = current.substringFromIndex(advance(current.startIndex, 12))

if(isYestoday == today){

var range = Range<String.Index>(start: advance(current.startIndex, 11),end: advance(current.startIndex, 2))

//                var result = current.substringFromIndex(advance(current.startIndex, 12))

if((current.substringWithRange(range) as NSString).doubleValue > 12){

return "上午\(result)"
}else{

return "下午\(result)"
}
}else if(isYestoday == yesterday){

return "下午\(result)"

}else{

//                if ([current hasPrefix:year]) {//今年
//                NSString *finalTime=[NSString stringWithFormat:@"%@",[current substringFromIndex:5]];
//                return finalTime;
//            }else{
//                return [[formatter stringFromDate:detaildate] substringToIndex:11];
//            }

if(current.hasPrefix("year")){

var name = current.substringFromIndex(advance(current.startIndex,5))

return name

}else{

var name = dateToString(detaildate, dateFormat: nil) as NSString

return current.substringFromIndex(advance(current.startIndex, 11))
}

}

}else if(timeDistance >= 60){

var minutes = timeDistance / 60

return "\(minutes)分钟前"

}else{

return "刚刚"

}
}
}