How to convert unix timestamp to date in Spark

Question

I have a data frame with a column of unix timestamp(eg.1435655706000), and I want to convert it to data with format \'yyyy-MM-DD\', I\'ve tried nscala-time but it doesn\'t w

Answer 1

What you can do is:

input.withColumn("time", concat(from_unixtime(input.col("COL_WITH_UNIX_TIME")/1000,
"yyyy-MM-dd'T'HH:mm:ss"), typedLit("."), substring(input.col("COL_WITH_UNIX_TIME"), 11, 3), 
typedLit("Z")))

where time is a new column name and COL_WITH_UNIX_TIME is the name of the column which you want to convert. This will give data in millis, making your data more accurate, like: "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"

Answer 2

You can use the following syntax in Java

input.select("timestamp)
            .withColumn("date", date_format(col("timestamp").$div(1000).cast(DataTypes.TimestampType), "yyyyMMdd").cast(DataTypes.IntegerType))

Answer 3

Since spark1.5 , there is a builtin UDF for doing that.

val df = sqlContext.sql("select from_unixtime(ts,'YYYY-MM-dd') as `ts` from mr")

Please check Spark 1.5.2 API Doc for more info.

Answer 4

Here it is using Scala DataFrame functions: from_unixtime and to_date

// NOTE: divide by 1000 required if milliseconds
// e.g. 1446846655609 -> 2015-11-06 21:50:55 -> 2015-11-06 
mr.select(to_date(from_unixtime($"ts" / 1000))) 

Answer 5

I have solved this issue using the joda-time library by mapping on the DataFrame and converting the DateTime into a String :

import org.joda.time._
val time_col = sqlContext.sql("select ts from mr")
                         .map(line => new DateTime(line(0)).toString("yyyy-MM-dd"))

Answer 6

import org.joda.time.{DateTimeZone}
import org.joda.time.format.DateTimeFormat

You need to import the following libraries.

val stri = new DateTime(timeInMillisec).toDateTime.toString("yyyy/MM/dd")

Or adjusting to your case :

 val time_col = sqlContext.sql("select ts from mr")
                     .map(line => new DateTime(line(0).toInt).toDateTime.toString("yyyy/MM/dd"))

There could be another way :

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

  val date = (new DateTime() + ((threshold.toDouble)/1000).toInt.seconds )
             .toString("yyyy/MM/dd")

Hope this helps :)