diff --git a/src/main/scala/io/archivesunleashed/ArchiveRecord.scala b/src/main/scala/io/archivesunleashed/ArchiveRecord.scala
index 97e39ef2..12b31fd9 100644
--- a/src/main/scala/io/archivesunleashed/ArchiveRecord.scala
+++ b/src/main/scala/io/archivesunleashed/ArchiveRecord.scala
@@ -21,7 +21,7 @@ import java.io.ByteArrayInputStream
 import java.security.MessageDigest
 
 import io.archivesunleashed.data.{ArcRecordUtils, WarcRecordUtils, ArchiveRecordWritable}
-import io.archivesunleashed.matchbox.{ComputeMD5RDD, ExtractDate, ExtractDomainRDD, RemoveHTTPHeaderRDD}
+import io.archivesunleashed.matchbox.{ComputeMD5RDD, ExtractDateRDD, ExtractDomainRDD, RemoveHTTPHeaderRDD}
 import org.apache.spark.SerializableWritable
 import org.archive.io.arc.ARCRecord
 import org.archive.io.warc.WARCRecord
@@ -84,25 +84,25 @@ class ArchiveRecordImpl(r: SerializableWritable[ArchiveRecordWritable]) extends
 
   val getCrawlDate: String = {
     if (recordFormat == ArchiveRecordWritable.ArchiveFormat.ARC){
-      ExtractDate(r.t.getRecord.asInstanceOf[ARCRecord].getMetaData.getDate,
-        ExtractDate.DateComponent.YYYYMMDD)
+      ExtractDateRDD(r.t.getRecord.asInstanceOf[ARCRecord].getMetaData.getDate,
+        ExtractDateRDD.DateComponent.YYYYMMDD)
     } else {
-      ExtractDate(
+      ExtractDateRDD(
         ArchiveUtils.get14DigitDate(
           ISO8601.parse(r.t.getRecord.asInstanceOf[WARCRecord].getHeader.getDate)),
-        ExtractDate.DateComponent.YYYYMMDD)
+        ExtractDateRDD.DateComponent.YYYYMMDD)
     }
   }
 
   val getCrawlMonth: String = {
     if (recordFormat == ArchiveRecordWritable.ArchiveFormat.ARC) {
-      ExtractDate(r.t.getRecord.asInstanceOf[ARCRecord].getMetaData.getDate,
-        ExtractDate.DateComponent.YYYYMM)
+      ExtractDateRDD(r.t.getRecord.asInstanceOf[ARCRecord].getMetaData.getDate,
+        ExtractDateRDD.DateComponent.YYYYMM)
     } else {
-      ExtractDate(
+      ExtractDateRDD(
         ArchiveUtils.get14DigitDate(
           ISO8601.parse(r.t.getRecord.asInstanceOf[WARCRecord].getHeader.getDate)),
-        ExtractDate.DateComponent.YYYYMM)
+        ExtractDateRDD.DateComponent.YYYYMM)
     }
   }
 
diff --git a/src/main/scala/io/archivesunleashed/df/package.scala b/src/main/scala/io/archivesunleashed/df/package.scala
index 29f7e3ba..cfc0c974 100644
--- a/src/main/scala/io/archivesunleashed/df/package.scala
+++ b/src/main/scala/io/archivesunleashed/df/package.scala
@@ -16,7 +16,7 @@
 package io.archivesunleashed
 
 import org.apache.commons.io.IOUtils
-import io.archivesunleashed.matchbox.ComputeMD5RDD
+import io.archivesunleashed.matchbox.{ComputeMD5RDD}
 import org.apache.spark.sql.functions.udf
 import org.apache.spark.sql.DataFrame
 import java.io.ByteArrayInputStream
@@ -51,6 +51,12 @@ package object df {
 
   val ComputeImageSizeDF = udf(io.archivesunleashed.matchbox.ComputeImageSize.apply(_: Array[Byte]))
 
+  val DetectLanguageDF = udf(io.archivesunleashed.matchbox.DetectLanguageRDD.apply(_: String))
+
+  val ExtractBoilerpipeTextDF = udf(io.archivesunleashed.matchbox.ExtractBoilerpipeTextRDD.apply(_: String))
+
+  val ExtractDateDF = udf((io.archivesunleashed.matchbox.ExtractDateRDD.apply(_: String, _: String)))
+
   /**
    * Given a dataframe, serializes binary object and saves to disk
    * @param df the input dataframe
diff --git a/src/main/scala/io/archivesunleashed/matchbox/DetectLanguage.scala b/src/main/scala/io/archivesunleashed/matchbox/DetectLanguageRDD.scala
similarity index 97%
rename from src/main/scala/io/archivesunleashed/matchbox/DetectLanguage.scala
rename to src/main/scala/io/archivesunleashed/matchbox/DetectLanguageRDD.scala
index 3934513f..a806661f 100644
--- a/src/main/scala/io/archivesunleashed/matchbox/DetectLanguage.scala
+++ b/src/main/scala/io/archivesunleashed/matchbox/DetectLanguageRDD.scala
@@ -20,7 +20,7 @@ import org.apache.tika.language.detect.LanguageDetector;
 import org.apache.tika.language.detect.LanguageResult;
 
 /** Detects language using Apache Tika. */
-object DetectLanguage {
+object DetectLanguageRDD {
 
   /** Detects the language of a String input.
    *
diff --git a/src/main/scala/io/archivesunleashed/matchbox/ExtractBoilerpipeText.scala b/src/main/scala/io/archivesunleashed/matchbox/ExtractBoilerpipeTextRDD.scala
similarity index 97%
rename from src/main/scala/io/archivesunleashed/matchbox/ExtractBoilerpipeText.scala
rename to src/main/scala/io/archivesunleashed/matchbox/ExtractBoilerpipeTextRDD.scala
index 78073e1d..ce58900b 100644
--- a/src/main/scala/io/archivesunleashed/matchbox/ExtractBoilerpipeText.scala
+++ b/src/main/scala/io/archivesunleashed/matchbox/ExtractBoilerpipeTextRDD.scala
@@ -19,7 +19,7 @@ import de.l3s.boilerpipe.extractors.DefaultExtractor
 import java.io.IOException
 
 /** Extract raw text content from an HTML page, minus "boilerplate" content (using boilerpipe).  */
-object ExtractBoilerpipeText {
+object ExtractBoilerpipeTextRDD {
   /** Uses boilerpipe to extract raw text content from a page.
    *
    * ExtractBoilerpipeText removes boilerplate text (e.g. a copyright statement) from an HTML string.
diff --git a/src/main/scala/io/archivesunleashed/matchbox/ExtractDate.scala b/src/main/scala/io/archivesunleashed/matchbox/ExtractDateRDD.scala
similarity index 67%
rename from src/main/scala/io/archivesunleashed/matchbox/ExtractDate.scala
rename to src/main/scala/io/archivesunleashed/matchbox/ExtractDateRDD.scala
index cf280e92..1ad69c4a 100644
--- a/src/main/scala/io/archivesunleashed/matchbox/ExtractDate.scala
+++ b/src/main/scala/io/archivesunleashed/matchbox/ExtractDateRDD.scala
@@ -16,7 +16,7 @@
 package io.archivesunleashed.matchbox
 
 /** Gets different parts of a dateString. */
-object ExtractDate {
+object ExtractDateRDD {
   object DateComponent extends Enumeration {
     /** An enum specifying years, months, days or a combination. */
     type DateComponent = Value
@@ -49,4 +49,29 @@ object ExtractDate {
         ""
     }
   }
+
+  /** Extracts a provided date component from a date (for DataFrames).
+    *
+    * @param fullDate date returned by `WARecord.getCrawlDate`, formatted as YYYYMMDD
+    * @param dateFormat in String format
+    */
+  def apply(fullDate: String, dateFormat: String): String = {
+    val startSS = 0
+    val yearSS = 4
+    val monthSS = 6
+    val daySS = 8
+    val maybeFullDate: Option[String] = Option(fullDate)
+    maybeFullDate match {
+      case Some(fulldate) =>
+        dateFormat match {
+          case "YYYY" => fullDate.substring(startSS, yearSS)
+          case "MM" => fullDate.substring(yearSS, monthSS)
+          case "DD" => fullDate.substring(monthSS, daySS)
+          case "YYYYMM" => fullDate.substring(startSS, monthSS)
+          case _ => fullDate.substring(startSS, daySS)
+        }
+      case None =>
+        ""
+    }
+  }
 }
diff --git a/src/main/scala/io/archivesunleashed/package.scala b/src/main/scala/io/archivesunleashed/package.scala
index 9bc8032b..a9f064ec 100644
--- a/src/main/scala/io/archivesunleashed/package.scala
+++ b/src/main/scala/io/archivesunleashed/package.scala
@@ -21,14 +21,14 @@ import java.util.Base64
 
 import io.archivesunleashed.data.{ArchiveRecordInputFormat, ArchiveRecordWritable}
 import ArchiveRecordWritable.ArchiveFormat
-import io.archivesunleashed.matchbox.{DetectLanguage, DetectMimeTypeTika, ExtractDate,
+import io.archivesunleashed.matchbox.{DetectLanguageRDD, DetectMimeTypeTika, ExtractDateRDD,
                                       ExtractDomainRDD, ExtractImageDetails, ExtractImageLinksRDD,
                                       ExtractLinksRDD, GetExtensionMimeRDD, RemoveHTMLRDD}
-import io.archivesunleashed.matchbox.ExtractDate.DateComponent
+import io.archivesunleashed.matchbox.ExtractDateRDD.DateComponent
 import org.apache.commons.codec.binary.Hex
 import org.apache.commons.io.FilenameUtils
 import org.apache.hadoop.fs.{FileSystem, Path}
-import io.archivesunleashed.matchbox.ExtractDate.DateComponent.DateComponent
+import io.archivesunleashed.matchbox.ExtractDateRDD.DateComponent.DateComponent
 import java.net.URI
 import java.net.URL
 import org.apache.spark.sql.{DataFrame, Row, SparkSession}
@@ -542,7 +542,7 @@ package object archivesunleashed {
       * @param component the selected DateComponent enum value
       */
     def keepDate(dates: List[String], component: DateComponent = DateComponent.YYYYMMDD): RDD[ArchiveRecord] = {
-      rdd.filter(r => dates.contains(ExtractDate(r.getCrawlDate, component)))
+      rdd.filter(r => dates.contains(ExtractDateRDD(r.getCrawlDate, component)))
     }
 
     /** Removes all data but selected exact URLs.
@@ -579,7 +579,7 @@ package object archivesunleashed {
       * @param lang a set of ISO 639-2 codes
       */
     def keepLanguages(lang: Set[String]): RDD[ArchiveRecord] = {
-      rdd.filter(r => lang.contains(DetectLanguage(RemoveHTMLRDD(r.getContentString))))
+      rdd.filter(r => lang.contains(DetectLanguageRDD(RemoveHTMLRDD(r.getContentString))))
     }
 
     /** Removes all content that does not pass Regular Expression test.
@@ -674,7 +674,7 @@ package object archivesunleashed {
       * @param lang a set of ISO 639-2 codes
       */
     def discardLanguages(lang: Set[String]): RDD[ArchiveRecord] = {
-      rdd.filter(r => !lang.contains(DetectLanguage(RemoveHTMLRDD(r.getContentString))))
+      rdd.filter(r => !lang.contains(DetectLanguageRDD(RemoveHTMLRDD(r.getContentString))))
     }
   }
 }
diff --git a/src/test/scala/io/archivesunleashed/ArcTest.scala b/src/test/scala/io/archivesunleashed/ArcTest.scala
index 08700d29..d5faf6db 100644
--- a/src/test/scala/io/archivesunleashed/ArcTest.scala
+++ b/src/test/scala/io/archivesunleashed/ArcTest.scala
@@ -17,8 +17,8 @@
 package io.archivesunleashed
 
 import com.google.common.io.Resources
-import io.archivesunleashed.matchbox.{DetectLanguage, DetectMimeTypeTika, ExtractLinksRDD, RemoveHTMLRDD, RemoveHTTPHeaderRDD}
-import io.archivesunleashed.matchbox.ExtractDate.DateComponent
+import io.archivesunleashed.matchbox.{DetectLanguageRDD, DetectMimeTypeTika, ExtractLinksRDD, RemoveHTMLRDD, RemoveHTTPHeaderRDD}
+import io.archivesunleashed.matchbox.ExtractDateRDD.DateComponent
 import org.apache.spark.{SparkConf, SparkContext}
 import org.junit.runner.RunWith
 import org.scalatest.junit.JUnitRunner
@@ -82,7 +82,7 @@ class ArcTest extends FunSuite with BeforeAndAfter {
     val languageCounts = RecordLoader.loadArchives(arcPath, sc)
       .keepMimeTypes(Set("text/html"))
       .map(r => RemoveHTMLRDD(r.getContentString))
-      .groupBy(content => DetectLanguage(content))
+      .groupBy(content => DetectLanguageRDD(content))
       .map(f => {
         (f._1, f._2.size)
       })
diff --git a/src/test/scala/io/archivesunleashed/RecordRDDTest.scala b/src/test/scala/io/archivesunleashed/RecordRDDTest.scala
index bb56119b..f5b89ea0 100644
--- a/src/test/scala/io/archivesunleashed/RecordRDDTest.scala
+++ b/src/test/scala/io/archivesunleashed/RecordRDDTest.scala
@@ -17,8 +17,8 @@
 package io.archivesunleashed
 
 import com.google.common.io.Resources
-import io.archivesunleashed.matchbox.ExtractDate
-import io.archivesunleashed.matchbox.ExtractDate.DateComponent
+import io.archivesunleashed.matchbox.ExtractDateRDD
+import io.archivesunleashed.matchbox.ExtractDateRDD.DateComponent
 import org.apache.spark.{SparkConf, SparkContext}
 import org.junit.runner.RunWith
 import org.scalatest.junit.JUnitRunner
@@ -62,7 +62,7 @@ class RecordRDDTest extends FunSuite with BeforeAndAfter {
     val base = RecordLoader.loadArchives(arcPath, sc)
     val component = DateComponent.YYYY
     val r = base
-      .filter (x => ExtractDate(x.getCrawlDate, component) == testDate)
+      .filter (x => ExtractDateRDD(x.getCrawlDate, component) == testDate)
       .map ( mp => mp.getUrl).take(3)
     val r2 = base.keepDate(List(testDate), component)
       .map ( mp => mp.getUrl).take(3)
diff --git a/src/test/scala/io/archivesunleashed/matchbox/ExtractBoilerPipeTextTest.scala b/src/test/scala/io/archivesunleashed/matchbox/ExtractBoilerPipeTextTest.scala
index 9a2841ce..17b01a60 100644
--- a/src/test/scala/io/archivesunleashed/matchbox/ExtractBoilerPipeTextTest.scala
+++ b/src/test/scala/io/archivesunleashed/matchbox/ExtractBoilerPipeTextTest.scala
@@ -32,14 +32,14 @@ class ExtractBoilerPipeTextTest extends FunSuite {
   var boiler = """Copyright 2017"""
 
   test("Collects boilerpipe") {
-    assert(ExtractBoilerpipeText(text) == boiler)
+    assert(ExtractBoilerpipeTextRDD(text) == boiler)
     // scalastyle:off null
-    assert(ExtractBoilerpipeText(null) == "")
+    assert(ExtractBoilerpipeTextRDD(null) == "")
     // scalastyle:on null
-    assert(ExtractBoilerpipeText("All Rights Reserved.") == "")
+    assert(ExtractBoilerpipeTextRDD("All Rights Reserved.") == "")
   }
 
   test("Removes Header information") {
-    assert(ExtractBoilerpipeText(header + text) == boiler)
+    assert(ExtractBoilerpipeTextRDD(header + text) == boiler)
   }
 }
diff --git a/src/test/scala/io/archivesunleashed/matchbox/ExtractDateTest.scala b/src/test/scala/io/archivesunleashed/matchbox/ExtractDateTest.scala
index 43576844..2104d5d0 100644
--- a/src/test/scala/io/archivesunleashed/matchbox/ExtractDateTest.scala
+++ b/src/test/scala/io/archivesunleashed/matchbox/ExtractDateTest.scala
@@ -16,7 +16,7 @@
 
 package io.archivesunleashed.matchbox
 
-import io.archivesunleashed.matchbox.ExtractDate.DateComponent.{DD, MM, YYYY, YYYYMM, YYYYMMDD}
+import io.archivesunleashed.matchbox.ExtractDateRDD.DateComponent.{DD, MM, YYYY, YYYYMM, YYYYMMDD}
 import org.junit.runner.RunWith
 import org.scalatest.FunSuite
 import org.scalatest.junit.JUnitRunner
@@ -26,13 +26,13 @@ class ExtractDateTest extends FunSuite {
 
   test("simple") {
     val date = "20151204"
-    assert(ExtractDate(date, YYYY) == "2015")
-    assert(ExtractDate(date, MM) == "12")
-    assert(ExtractDate(date, DD) == "04")
-    assert(ExtractDate(date, YYYYMM) == "201512")
-    assert(ExtractDate(date, YYYYMMDD) == date)
+    assert(ExtractDateRDD(date, YYYY) == "2015")
+    assert(ExtractDateRDD(date, MM) == "12")
+    assert(ExtractDateRDD(date, DD) == "04")
+    assert(ExtractDateRDD(date, YYYYMM) == "201512")
+    assert(ExtractDateRDD(date, YYYYMMDD) == date)
     // scalastyle:off null
-    assert(ExtractDate(null, YYYYMMDD) == "")
+    assert(ExtractDateRDD(null, YYYYMMDD) == "")
     // scalastyle:on null
   }
 
@@ -42,10 +42,10 @@ class ExtractDateTest extends FunSuite {
     val yearSS = 4
     val monthSS = 6
     val daySS = 8
-    assert(ExtractDate(date, YYYY) == date.substring(startSS, yearSS))
-    assert(ExtractDate(date, MM) == date.substring(yearSS, monthSS))
-    assert(ExtractDate(date, DD) == date.substring(monthSS, daySS))
-    assert(ExtractDate(date, YYYYMM) == date.substring(startSS, monthSS))
-    assert(ExtractDate(date, YYYYMMDD) == date.substring(startSS, daySS))
+    assert(ExtractDateRDD(date, YYYY) == date.substring(startSS, yearSS))
+    assert(ExtractDateRDD(date, MM) == date.substring(yearSS, monthSS))
+    assert(ExtractDateRDD(date, DD) == date.substring(monthSS, daySS))
+    assert(ExtractDateRDD(date, YYYYMM) == date.substring(startSS, monthSS))
+    assert(ExtractDateRDD(date, YYYYMMDD) == date.substring(startSS, daySS))
   }
 }