Scala日期和字符串互转及简单日期计算

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最新推荐文章于 2023-03-15 16:51:44 发布

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分类专栏： scala 文章标签： spark

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import java.text.SimpleDateFormat 
import java.util.Calendar

val start_date = "20180101"
val date_pattern = "yyyyMMdd"
val tmp_start_date = new SimpleDateFormat(date_pattern).parse(start_date)
//结果：tmp_start_date: java.util.Date = Mon Jan 01 00:00:00 CST 2018

val cal = Calendar.getInstance()
//结果：cal: java.util.Calendar = java.util.GregorianCalendar[time=1615860466410,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2021,MONTH=2,WEEK_OF_YEAR=12,WEEK_OF_MONTH=3,DAY_OF_MONTH=16,DAY_OF_YEAR=75,DAY_OF_WEEK=3,DAY_OF_WEEK_IN_MONTH=3,AM_PM=0,HOUR=10,HOUR_OF_DAY=10,MINUTE=7,SECOND=46,MILLISECOND=410,ZONE_OFFSET=28800000,DST_OFFSET=0]


cal.setTime(tmp_start_date)


//日期减去一天
cal.add(Calendar.DATE, -1)

val last_date = new SimpleDateFormat(date_pattern).format(cal.getTime)
//结果：last_date: String = 20171231