因为做一个考勤系统,需要用到scala的时间和日期的处理,包括
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等,特此总结了一下。
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}
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、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}
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}
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}
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}
7、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}
8、时间戳转化为时间,原理同上
def timeFormat(time:String):String={var sdf:SimpleDateFormat = new SimpleDateFormat("HH:mm:ss")var date:String = sdf.format(new Date((time.toLong*1000l)))date}
测试一下
def main(args: Array[String]) {print("现在时间:"+Tool.getNowDate())print("昨天时间:"+Tool.getYesterday())print("本周开始"+Tool.getNowWeekStart())print("本周结束"+Tool.getNowWeekEnd())print("本月开始"+Tool.getNowMonthStart())print("本月结束"+Tool.getNowMonthEnd())print("\n")print(Tool.timeFormat("1436457603"))print(Tool.DateFormat("1436457603"))}
10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/3600var decf:DecimalFormat=new DecimalFormat("#.00")decf.format(hour)//格式化}