scala 时间，时间格式转换

scala 时间，时间格式转换

import java.time.LocalDate

object fileTest {
  def main(args: Array[String]) {
    var nowdate = LocalDate.now()
    println("LocalDate.now()-->现在的时间是"+LocalDate.now())
    println("nowdate.plusDays-->明天是-->"+nowdate.plusDays(1))
    println("nowdate.minusDays-->昨天是-->"+nowdate.minusDays(1))
    println("nowdate.plusMonths-->今天加一个月-->"+nowdate.plusMonths(1))
    println("nowdate.minusMonths-->今天减一个月-->"+nowdate.minusMonths(1))
    println("nowdate.getDayOfYear-->今天是今年的第"+nowdate.getDayOfYear+"天")
    println("nowdate.getDayOfMonth->这个月有"+nowdate.getDayOfMonth+"天")
    println("nowdate.getDayOfWeek-->今天星期"+nowdate.getDayOfWeek)
    println("nowdate.getMonth-->这个月是"+nowdate.getMonth)
  }
}

1.scala 时间格式转换（String、Long、Date）

1.1时间字符类型转Date类型

import java.text.SimpleDateFormat 
val time = "2017-12-18 00:01:56" 
val newtime :Date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time) 
println(newtime)

1.2Long类型转字符类型

val time:Long= 1513839667//秒 
val newtime :String = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(time*1000) 
println(newtime)

1.3时间字符类型转Long类型

val time = "2017-12-18 00:01:56" 
val newtime :Long= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time).getTime 
println(newtime)

2.scala 时间和时间戳互转

2.1时间转换为时间戳

import java.text.SimpleDateFormat
object test {

def main(args: Array[String]): Unit = {

	val tm = "2017-08-01 16:44:32"
		val a = tranTimeToLong(tm)
		println(a)	
	}
	
	def tranTimeToLong(tm:String) :Long={
		val fm = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
		val dt = fm.parse(tm)
		val aa = fm.format(dt)
		val tim: Long = dt.getTime()
		tim
	}
}

2.2时间戳转化为时间

import java.text.SimpleDateFormat
import java.util.Date

object test {

	def main(args: Array[String]): Unit = {
		val tm = "1502036122000"
		val a = tranTimeToString(tm)
		println(a)
	}

	def tranTimeToString(tm:String) :String={
		val fm = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
		val tim = fm.format(new Date(tm.toLong))
		tim
	}
}

  def timeFormat(time:String):String={
    var sdf:SimpleDateFormat = new SimpleDateFormat("HH:mm:ss")
    var date:String = sdf.format(new Date((time.toLong*1000l)))
    date
  }

2.3将时间戳转化成日期

时间戳是秒数，需要乘以1000l转化成毫秒

  def DateFormat(time:String):String={
    var sdf:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd")
    var date:String = sdf.format(new Date((time.toLong*1000l)))
    date
  }

3.获取今天日期，昨天日期，本周时间，本月时间，时间戳转换日期时间比较计算时间差

3.1获取今天日期

  def getNowDate():String={
    var now:Date = new Date()
    var  dateFormat:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd")
    var hehe = dateFormat.format( now )
    hehe
  }

3.2获取昨天的日期

  def getYesterday():String={
    var  dateFormat:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd")
    var cal:Calendar=Calendar.getInstance()
    cal.add(Calendar.DATE,-1)
    var yesterday=dateFormat.format(cal.getTime())
    yesterday

3.3获取本周开始日期

  def getNowWeekStart():String={
    var period:String=""
    var cal:Calendar =Calendar.getInstance();
    var df:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY)
     //获取本周一的日期
    period=df.format(cal.getTime())
    period
  }

3.4获取本周末的时间

  def getNowWeekEnd():String={
    var period:String=""
    var cal:Calendar =Calendar.getInstance();
    var df:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);//这种输出的是上个星期周日的日期，因为老外把周日当成第一天
    cal.add(Calendar.WEEK_OF_YEAR, 1)// 增加一个星期，才是我们中国人的本周日的日期
    period=df.format(cal.getTime())
    period
  }

3.5本月的第一天

  def getNowMonthStart():String={
    var period:String=""
    var cal:Calendar =Calendar.getInstance();
    var df:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    cal.set(Calendar.DATE, 1)
    period=df.format(cal.getTime())//本月第一天
    period
  }

3.6本月的最后一天

  def getNowMonthEnd():String={
    var period:String=""
    var cal:Calendar =Calendar.getInstance();
    var df:SimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    cal.set(Calendar.DATE, 1)
    cal.roll(Calendar.DATE,-1)
    period=df.format(cal.getTime())//本月最后一天
    period
  }

4.计算时间差

    //核心工作时间，迟到早退等的的处理
    def getCoreTime(start_time:String,end_Time:String)={
      var df:SimpleDateFormat=new SimpleDateFormat("HH:mm:ss")
      var begin:Date=df.parse(start_time)
      var end:Date = df.parse(end_Time)
      var between:Long=(end.getTime()-begin.getTime())/1000//转化成秒
      var hour:Float=between.toFloat/3600
      var decf:DecimalFormat=new DecimalFormat("#.00")
      decf.format(hour)//格式化
    }

5.Scala日期处理

5.1计算时间间隔

val d = new java.text.SimpleDateFormat("yyyyMMdd HH:mm:ss").format(new java.util.Date())
 
    val dateFormat = new java.text.SimpleDateFormat("yyyyMMdd HH:mm:ss")
 
    // 系统时间
    val d1 = new java.util.Date()
    val nowDate: String = dateFormat.format(d1)
 
    // 输入指定时间
    val dd: Date = dateFormat.parse("20161229 14:20:50")
 
    // 时间差
    val d3 = new java.util.Date()
    val d4 = new java.util.Date()
    val diff = d4.getTime - d3.getTime  // 返回自此Date对象表示的1970年1月1日，00:00:00 GMT以来的毫秒数。
    val diffMinutes = diff / (1000 * 60)  // 时间间隔，单位：分钟

5.2产生日期序列

import java.util.Calendar
   import java.util.Date
   import java.text.SimpleDateFormat
   import scala.collection.mutable.ListBuffer
 
   // 输入开始日期和结束日期
   val stringDateBegin: String = "20160101"
   val stringDateEnd: String = "20160209"
 
   val dateFormat: SimpleDateFormat = new SimpleDateFormat("yyyyMMdd")
   val dateBegin: Date = dateFormat.parse(stringDateBegin)
   val dateEnd: Date = dateFormat.parse(stringDateEnd)
 
   val calendarBegin: Calendar = Calendar.getInstance()
   val calendarEnd: Calendar = Calendar.getInstance()
 
   calendarBegin.setTime(dateBegin)
   calendarEnd.setTime(dateEnd)
 
   // 计算日期间隔天数
   val diff = calendarEnd.getTimeInMillis() - calendarBegin.getTimeInMillis()
   val diffDay = (diff / (1000 * 60 * 60 * 24)).toInt
   val calendarList = new ListBuffer[String]()
   for (d <- 0 to diffDay) {
     // 日期转化成"yyyyMMdd"
     calendarList.append(dateFormat.format(calendarBegin.getTime()))
     calendarBegin.add(Calendar.DAY_OF_MONTH, 1)
   }
 
   calendarList.mkString(",")

执行结果：

// 输入开始日期和结束日期
val stringDateBegin: String = "20160101"
stringDateBegin: String = 20160101
 
val stringDateEnd: String = "20160209"
stringDateEnd: String = 20160209
 
val dateFormat: SimpleDateFormat = new SimpleDateFormat("yyyyMMdd")
dateFormat: java.text.SimpleDateFormat = java.text.SimpleDateFormat@ef87e460
 
val dateBegin: Date = dateFormat.parse(stringDateBegin)
dateBegin: java.util.Date = Fri Jan 01 00:00:00 UTC 2016
 
val dateEnd: Date = dateFormat.parse(stringDateEnd)
dateEnd: java.util.Date = Tue Feb 09 00:00:00 UTC 2016
 
val calendarBegin: Calendar = Calendar.getInstance()
calendarBegin: java.util.Calendar = java.util.GregorianCalendar[time=1480484154627,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Etc/Universal",offse
t=0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2016,MONTH=10,WEEK_OF_YEAR=49,WEEK_OF_MONTH=5,DAY_OF_MONTH=30,DAY_OF_YEAR=335,DAY_OF_WEEK=4,DAY_OF_WEEK_IN_MONTH=5,AM_PM=0,HOUR=5,HOUR_OF_DAY=5,MINUTE=35,SECOND=54,MILLISECOND=627,ZONE_OFFSET=0,DST_OFFSET=0]
 
val calendarEnd: Calendar = Calendar.getInstance()
calendarEnd: java.util.Calendar = java.util.GregorianCalendar[time=1480484154845,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Etc/Universal",offset=
0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2016,MONTH=10,WEEK_OF_YEAR=49,WEEK_OF_MONTH=5,DAY_OF_MONTH=30,DAY_OF_YEAR=335,DAY_OF_WEEK=4,DAY_OF_WEEK_IN_MONTH=5,AM_PM=0,HOUR=5,HOUR_OF_DAY=5,MINUTE=35,SECOND=54,MILLISECOND=845,ZONE_OFFSET=0,DST_OFFSET=0]
 
calendarBegin.setTime(dateBegin)
calendarEnd.setTime(dateEnd)
 
// 计算日期间隔天数
val diff = calendarEnd.getTimeInMillis() - calendarBegin.getTimeInMillis()
diff: Long = 3369600000
 
val diffDay = (diff / (1000 * 60 * 60 * 24)).toInt
diffDay: Int = 39
 
val calendarList = new ListBuffer[String]()
calendarList: scala.collection.mutable.ListBuffer[String] = ListBuffer()
 
for (d <- 0 to diffDay) {
    // 日期转化成"yyyyMMdd"
    calendarList.append(dateFormat.format(calendarBegin.getTime()))
    calendarBegin.add(Calendar.DAY_OF_MONTH, 1)
          }
 
calendarList.mkString(",")
res12: String = 20160101,20160102,20160103,20160104,20160105,20160106,20160107,20160108,20160109,20160110,20160111,20160112,20160113,20160114,20160115,20160116,20160117,20160118,20160119,2016
0120,20160121,20160122,20160123,20160124,20160125,20160126,20160127,20160128,20160129,20160130,20160131,20160201,20160202,20160203,20160204,20160205,20160206,20160207,20160208,20160209
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原文地址：https://www.cnblogs.com/aixing/p/13327356.html