从时间戳中提取年份时总是得到“1970”

val campaign_startdate_year: String = Utils.getYear(campaign_startdate_timestamp).toString

问题是我总是得到相同的一年 1970 .这可能是什么原因?

import com.github.nscala_time.time.Imports._

def getYear(timestamp: Any): Int = {
    var dt = 2017
    if (!timestamp.toString.isEmpty)
    {
      dt = new DateTime(timestamp.toString.toLong).getYear // toLong should be multiplied by 1000 to get millisecond value
    }
    dt
  }

当我想得到一个月中的某一天时,也会出现同样的问题。我明白了 17 28

  def getDay(timestamp: Any): Int = {
    var dt = 1
    if (!timestamp.toString.isEmpty)
    {
      dt = new DateTime(timestamp.toString.toLong).getDayOfYear
    }
    dt
  }