Scala103-日期处理

Scala103-日期处理

Intro

介绍常用的日期处理方法。

时间获取

import org.joda.time.format.DateTimeFormatimport org.joda.time.{DateTime, Period,Duration}

Intitializing Scala interpreter ...Spark Web UI available at available as 'sc' (version = 2.4.4, master = local[*], app id = local-1578101041406)SparkSession available as 'spark'import org.joda.time.format.DateTimeFormatimport org.joda.time.{DateTime, Period, Duration}

获取当前时间-时间戳

val nowTimestamp = System.currentTimeMillis()

nowTimestamp: Long = 1578101045890

获取当前时间-日期

val nowDate = new DateTime(nowTimestamp)

nowDate: org.joda.time.DateTime = 2020-01-04T09:24:05.890+08:00

格式化日期

把日期转换成字符串，主要对应三种格式：

yyyy-MM-dd HH:mm:ssyyyy-MM-ddyyyyMMdd

val DateFormat1 = "yyyy-MM-dd HH:mm:ss"val DateFormat2 = "yyyy-MM-dd"val DateFormat3 = "yyyyMMdd"

DateFormat1: String = yyyy-MM-dd HH:mm:ssDateFormat2: String = yyyy-MM-ddDateFormat3: String = yyyyMMdd

Array(DateFormat1,DateFormat2,DateFormat3).foreach(x=>println("["+x+"] =>"+" Convert to=>"+nowDate.toString(x)))

[yyyy-MM-dd HH:mm:ss] => Convert to=>2020-01-04 09:24:05[yyyy-MM-dd] => Convert to=>2020-01-04[yyyyMMdd] => Convert to=>20200104

类型转换

时间戳转换

时间戳转日期

new DateTime(nowTimestamp)

res1: org.joda.time.DateTime = 2020-01-04T09:24:05.890+08:00

nowDate.getClass.getSimpleName

res2: String = DateTime

日期转时间戳

nowDate.getMillis

res3: Long = 1578101045890

字符串转换

日期转字符串

nowDate.toString("yyyy-MM-dd")

res4: String = 2020-01-04

字符串转日期 注意，如果字符串没有时分秒，会默认转成0点0分0秒

val StringDateArray = Array("2020-01-01 10:10:10","2020-01-02","20200103")val FormatArray = Array(DateFormat1,DateFormat2,DateFormat3)

StringDateArray: Array[String] = Array(2020-01-01 10:10:10, 2020-01-02, 20200103)FormatArray: Array[String] = Array(yyyy-MM-dd HH:mm:ss, yyyy-MM-dd, yyyyMMdd)

for(i<-0 until 3){println("Raw:"+StringDateArray(i)+"\n"+"New:"+DateTime.parse(StringDateArray(i), DateTimeFormat.forPattern(FormatArray(i))))}

Raw:2020-01-01 10:10:10New:2020-01-01T10:10:10.000+08:00Raw:2020-01-02New:2020-01-02T00:00:00.000+08:00Raw:20200103New:2020-01-03T00:00:00.000+08:00

运算

转换成时间戳

repeat once more

DateTime.parse("2020-01-01 01:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getMillis

res6: Long = 1577811601000

时刻属性

该时刻所拥有的属性，如

属于当天的哪一个小时属于该小时的哪一分钟属于分钟的哪一秒

时分秒

DateTime.parse("2020-01-01 21:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getHourOfDay

res7: Int = 21

DateTime.parse("2020-01-01 11:11:11",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getMinuteOfHour

res8: Int = 11

DateTime.parse("2020-01-01 11:12:31",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getSecondOfMinute

res9: Int = 31

再如：

该日期属于哪一个月该日期属于当年的第几周该日期属于周几该日期属于当年的第几天

月份信息

DateTime.parse("2019-12-29 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getMonthOfYear

res10: Int = 12

DateTime.parse("2020-01-01 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getMonthOfYear

res11: Int = 1

周信息 注意，跨年度的周，从1记起

DateTime.parse("2019-12-29 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getWeekOfWeekyear

res12: Int = 52

DateTime.parse("2019-12-31 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getWeekOfWeekyear

res13: Int = 1

DateTime.parse("2020-01-01 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getWeekOfWeekyear

res14: Int = 1

周几信息

周一即为1，周日为7

DateTime.parse("2019-12-31 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getDayOfWeek

res15: Int = 2

DateTime.parse("2020-01-01 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getDayOfWeek

res16: Int = 3

该日期在当年的天数

DateTime.parse("2020-01-01 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getDayOfYear

res17: Int = 1

DateTime.parse("2019-12-31 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss")).getDayOfYear

res18: Int = 365

还有其他的方法，暂时用不到，不赘

两日期间隔

val testDate1 = DateTime.parse("2020-01-01 01:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss"))val testDate2 = DateTime.parse("2020-01-01 02:00:02",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss"))val testDate3 = DateTime.parse("2019-12-31 02:00:01",DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss"))

testDate1: org.joda.time.DateTime = 2020-01-01T01:00:01.000+08:00testDate2: org.joda.time.DateTime = 2020-01-01T02:00:02.000+08:00testDate3: org.joda.time.DateTime = 2019-12-31T02:00:01.000+08:00

val diffDuration = new Duration(testDate1,testDate2)

diffDuration: org.joda.time.Duration = PT3601S

毫秒为单位

diffDuration.getMillis

res19: Long = 3601000

//实际相差1小时1秒 (60*60+1)*1000

res20: Int = 3601000

秒为单位

diffDuration.getStandardSeconds

res21: Long = 3601

分钟为单位 直接取整

diffDuration.getStandardMinutes

res22: Long = 60

小时为单位

diffDuration.getStandardHours

res23: Long = 1

天为单位

diffDuration.getStandardDays

res24: Long = 0

某日期间隔N天的日期

间隔为正，向后推算；间隔为负，向前推算

plusDays 天数为单位plusMonths 月份为单位

其他的不多说，用到再补充~

testDate1

res25: org.joda.time.DateTime = 2020-01-01T01:00:01.000+08:00

testDate1.plusDays(1)

res26: org.joda.time.DateTime = 2020-01-02T01:00:01.000+08:00

testDate1.plusDays(-1)

res27: org.joda.time.DateTime = 2019-12-31T01:00:01.000+08:00

testDate1.plusMonths(1)

res28: org.joda.time.DateTime = 2020-02-01T01:00:01.000+08:00

时间比较

时间比较具体如下：

isAfterisBeforisEqual

testDate1.isAfter(testDate2)

res29: Boolean = false

testDate1.isBefore(testDate2)

res30: Boolean = true

testDate1.isEqual(testDate2)

res31: Boolean = false

生成日期list

import scala.collection.mutable.ArrayBufferdef dateRangeList(from: String, to: String,stepdays:Int=1,format:String="yyyy-MM-dd"):Array[String]={ // 先转换成日期 val fromDate = DateTime.parse(from,DateTimeFormat.forPattern("yyyy-MM-dd")) val toDate = DateTime.parse(to,DateTimeFormat.forPattern("yyyy-MM-dd")).plusDays(1) val dateRangeBuffer = ArrayBuffer[String]() var tempDate = fromDate while(tempDate.isBefore(toDate)){ dateRangeBuffer.append(tempDate.toString(format)) tempDate = tempDate.plusDays(stepdays) } dateRangeBuffer.toArray}

import scala.collection.mutable.ArrayBufferdateRangeList: (from: String, to: String, stepdays: Int, format: String)Array[String]

dateRangeList("2019-12-25","2019-12-30").mkString("\n")

res32: String =2019-12-252019-12-262019-12-272019-12-282019-12-292019-12-30

dateRangeList(from="2019-12-25",to="2019-12-30",stepdays=2).mkString("\n")

res33: String =2019-12-252019-12-272019-12-29

Ref

​​[1]于南京市江宁区九龙湖

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