swift - DateUtil

class DateUtil: NSObject {

class func dateFormatterStrByM(dateStr:String)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy-MM-dd HH:mm:ss"
let date:NSDate=dateFormatter.dateFromString(dateStr)!

let showFormatter:NSDateFormatter=NSDateFormatter()
showFormatter.dateFormat="MM月dd日 HH:mm"
return showFormatter.stringFromDate(date)
}

//根据时间字符转换为固定格式的时间字符串，精确到分钟 如：2015-12-21 22:10
class func dateFormatterStrByS(dateStr:String)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy-MM-dd HH:mm:ss"
let date:NSDate=dateFormatter.dateFromString(dateStr)!

let showFormatter:NSDateFormatter=NSDateFormatter()
showFormatter.dateFormat="yyyy-MM-dd"
return showFormatter.stringFromDate(date)
}

//根据时间字符转换为固定格式的时间字符串，精确到分钟 如：2015-12-21 22:10
class func dateFormatterStr(dateStr:String)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy/MM/dd HH:mm:ss"
let date:NSDate=dateFormatter.dateFromString(dateStr)!

let showFormatter:NSDateFormatter=NSDateFormatter()
showFormatter.dateFormat="yyyy-MM-dd HH:mm"
return showFormatter.stringFromDate(date)
}

//根据时间字符转换为固定格式的时间字符串如：2015-12-21
class func dateFormatterDay(dateStr:String)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy/MM/dd HH:mm:ss"
let date:NSDate=dateFormatter.dateFromString(dateStr)!

let showFormatter:NSDateFormatter=NSDateFormatter()
showFormatter.dateFormat="yyyy-MM-dd"
return showFormatter.stringFromDate(date)
}

//根据时间字符转换为固定格式的时间字符串，精确到分钟 如：22:10:11
class func dateFormatterhms(dateStr:String)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy/MM/dd HH:mm:ss"
let date:NSDate=dateFormatter.dateFromString(dateStr)!

let showFormatter:NSDateFormatter=NSDateFormatter()
showFormatter.dateFormat="HH:mm:ss"
return showFormatter.stringFromDate(date)
}

//根据时间戳还原时间格式，精确到秒，如：2015-12-21 22:10:10
class func restoreTimeFullString(date:NSTimeInterval)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy/MM/dd HH:mm:ss"
let pointDate:NSDate=NSDate(timeIntervalSince1970: date)
return dateFormatter.stringFromDate(pointDate)
}

//根据时间戳显示时间格式，精确到分钟，如：2015-12-21 22:10
class func minuteFullString(date:Double)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy-MM-dd HH:mm"
let pointDate:NSDate=NSDate(timeIntervalSince1970: NSTimeInterval(date))
return dateFormatter.stringFromDate(pointDate)
}

//根据时间戳显示时间格式，精确到分钟，如：12月21日 22:10
class func jieMinuteFullString(date:Double)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="MM月dd日 HH:mm"
let pointDate:NSDate=NSDate(timeIntervalSince1970: NSTimeInterval(date))
return dateFormatter.stringFromDate(pointDate)
}

//根据时间字符转换为1970年以来的时间戳(精确)，单位为秒
class func dateTimestampExact(dateStr:String)->Double{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="yyyy/MM/dd HH:mm:ss"
let date:NSDate=dateFormatter.dateFromString(dateStr)!
return date.timeIntervalSince1970
}

//根据时间戳显示小时格式，如： 22:10
class func hourString(date:Double)->String{
let dateFormatter:NSDateFormatter=NSDateFormatter()
dateFormatter.dateFormat="HH:mm"
let pointDate:NSDate=NSDate(timeIntervalSince1970: NSTimeInterval(date))
return dateFormatter.stringFromDate(pointDate)
}

//根据时间戳显示简要时间描述格式，如：今天 22:10
class func getDescTime(date:Double,sysDate:Double)->String{
var descTime:String=""
var hourTime:String=""
if date>0{
let d1_time:Double=round(date * 1000)
let d2_time:Double=round(sysDate * 1000)
let days:Int=Int(daysBetween(d2_time,bdate: d1_time))
hourTime=hourString(date)

if days<0 {
let daysAfter:Int=abs(days)
if(daysAfter==0){
descTime="今天"
}else{
return jieMinuteFullString(date)
//descTime="\(daysAfter)天后"
}
return "\(descTime) \(hourTime)"
}

if(days==0){
descTime="今天"
}else if(days==1){
descTime="昨天"
}else if(days==2){
descTime="前天"
}else if(days>2 && days<7){
descTime="\(days)天前"
}else if(days>=7 && days<=30){
descTime="一周前"
}else if(days>=30 && days<=182){
descTime="一月前"
}else if(days>=182 && days<=365){
descTime="半年前"
}else if(days>=365){
descTime="一年前"
}else{
return minuteFullString(date)
}

return "\(descTime) \(hourTime)"

}else{
return minuteFullString(date)
}

}

//显示倒计时
class func countDown(date:Double,ntimes:Double,timeOver:()->Void)->String{
var teimsdescs:String=""
if date>0{
let d1_time:Double=date*Double(1000)
let d2_teim:Double=ntimes*Double(1000)

let diff:Int64 = Int64(round(d1_time-d2_teim))

if diff>0{
let day:Int64=diff/(24*60*60*1000)
let hour:Int64=diff/(60*60*1000)-(day*24)

let min:Int64=((diff / (60*1000))-(day*24*60)-(hour*60))

let s:Int64=diff / 1000 - (day*24*60*60)-(hour*60*60)-(min*60)

teimsdescs="\(day)天\(hour)时\(min)分\(s)秒"
}else{
timeOver()
}
}
return teimsdescs
}

//时间差运算
class func daysBetween(smdate:Double,bdate:Double)->Double{
return (smdate/Double(86400000))-(bdate/Double(86400000))
}

/**
* 判断两个时间之间的相差天数 (为正整数时间)
* @param preTime
* @param nowTime
* @return
*/
class func diffDay(preTime:Double,nowTime:Double)->Double{
return abs((nowTime - preTime) / 1000 / 3600 / 24)
}

}