Scala time processing-get today's date, yesterday's date, week time, month time, timestamp conversion date, time comparison

Because making a time-attendance system, you need to use Scala for the processing of dates and times, including
Get today's date, yesterday's date, this week time, this month time, time stamp conversion Date Time comparison calculation timing, and so on, hereby summarizes.

1. Get today's date

  Def getnowdate (): string={
    var now:date = new Date ()
    var  dateformat:simpledateformat = new SimpleDateFormat ("Yyyy-mm-dd")
    var hehe = Dateformat.format (now)
    hehe
  }

2, get yesterday's date

  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. Get the start date of the week

  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)
     //Get this Monday date
    Period=df.format (Cal.gettime ())
    period
  }

4. Get the time of the week

  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);//This output is the date of Sunday of last week, because foreigners regard Sunday as the first day
    Cal.add (calendar.week_of_ Year, 1)//Add one weeks, is the date of our Chinese this Sunday
    Period=df.format (Cal.gettime ())
    period
  }

5, the first day of the month

  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 ())//first day of the month
    period
  }

6, the last day of this month

  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 ())//Last day
    of the month Period
  }

7. Convert Timestamps to Dates
Timestamp is the number of seconds that need to be multiplied by 1000l into milliseconds

  def dateformat (time:string): string={
    var sdf:simpledateformat = new SimpleDateFormat ("Yyyy-mm-dd")
    var date:string = Sdf.format (new date ((time.tolong*1000l)))
    Date
  }

8, time stamp conversion to time, the principle of ibid.

  def timeformat (time:string): string={
    var sdf:simpledateformat = new SimpleDateFormat ("HH:mm:ss")
    var date: String = Sdf.format (new date ((time.tolong*1000l)))
    Date
  }

9. Test it.

def main (args:array[string]) {

    print ("Now Time:" +tool.getnowdate ())
    print ("Yesterday Time:" +tool.getyesterday ())
    Print ("Start this Week" +tool.getnowweekstart ()) print ("
    end of Week" +tool.getnowweekend ())

    print ("Start this month" + Tool.getnowmonthstart ()) Print (
    "End of Month" +tool.getnowmonthend ()) print (

    "\ n") print (

    Tool.timeformat ( "1436457603"))
    print (Tool.dateformat ("1436457603"))


  }

10. Calculating the time difference

/ / Core work time, late to leave early, etc.
     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//converted to seconds
       Var hour:Float=between.toFloat/3600
       Var decf:DecimalFormat=new DecimalFormat("#.00")
       Decf.format(hour)//format

     }