scala 的时间方面的处理

最近开始写scala程序，发现scala和python的相似度极高，写一下scala时间方面的处理；

1、一个时间戳怎么转化成yyyyMMddHH的格式：

import java.text.SimpleDateFormat
import java.util.Date
import java.util.Calendar
import java.lang.Long
import java.util.TimeZone

def transformat(date:String,pattern:String):String ={
val myformat = new SimpleDateFormat(pattern)
myformat.setTimeZone(TimeZone.getTimeZone("GMT"+8))
val time=new Date(Long.valueof(date)*1000L)
myformat.format(time)}

2、怎么将进行时间加减

def addtime(date:String,num:Int):String ={
val myformat = new SimpleDateFormat("yyyyMMddHH")
var dnow = new Date()
if(date !=""){
dnow=myformat.parse(date)}
var cal = Calendar.getInstance()
cal.setTime(dnow)
cal.add(Calendar.DAY_OF_MONTH,num)
val newday= cal.getTime()
myformat.format(newday)
}

3、怎么对时间进行周末日判断

ef isweekd(date:String,pattern:String):Int ={
val myformat = new SimpleDateFormat("pattern")
var dnow =new Date()
if(date !=""){
dnow =myformat.parse(date)}
val cal = Calendar.getInstance()
cal.setTime(dnow)
val week=cal.get(Calendar.DAY_OF_WEEK)
if (week ==1 || week==7){0}
else{1}}