diff --git a/tools/cldr-code/pom.xml b/tools/cldr-code/pom.xml
index 361f456f889..d58ede1ea3d 100644
--- a/tools/cldr-code/pom.xml
+++ b/tools/cldr-code/pom.xml
@@ -62,6 +62,12 @@
 			<groupId>com.vdurmont</groupId>
 			<artifactId>semver4j</artifactId>
 		</dependency>
+
+		<!-- persistent data structures -->
+		<dependency>
+			<groupId>org.pcollections</groupId>
+			<artifactId>pcollections</artifactId>
+		</dependency>
 	</dependencies>
 
 	<build>
diff --git a/tools/cldr-code/src/main/java/org/unicode/cldr/tool/GenerateDateTimeTestData.java b/tools/cldr-code/src/main/java/org/unicode/cldr/tool/GenerateDateTimeTestData.java
new file mode 100644
index 00000000000..9b19da5669a
--- /dev/null
+++ b/tools/cldr-code/src/main/java/org/unicode/cldr/tool/GenerateDateTimeTestData.java
@@ -0,0 +1,104 @@
+package org.unicode.cldr.tool;
+
+import java.io.IOException;
+import java.util.Arrays;
+import org.pcollections.HashPMap;
+import org.pcollections.HashTreePMap;
+import org.pcollections.PMap;
+import org.pcollections.PVector;
+import org.pcollections.TreePVector;
+import org.unicode.cldr.util.CLDRPaths;
+import org.unicode.cldr.util.TempPrintWriter;
+
+public class GenerateDateTimeTestData {
+
+  private static final String OUTPUT_SUBDIR = "datetime";
+
+  private static final String OUTPUT_FILENAME = "datetime.txt";
+
+  private static final PVector<String> NUMBERING_SYSTEMS =
+      TreePVector.from(Arrays.asList("latn", "arab", "beng"));
+
+  private static final PVector<String> LOCALES =
+      TreePVector.from(Arrays.asList("en-US", "en-GB",
+          "zh-TW", "vi", "ar", "mt-MT",
+          "bn", "zu",
+          "und"));
+
+  private static final HashPMap<String,Object> emptyMapStringToObject = HashTreePMap.empty();
+
+  private static final PVector<PMap<String, Object>> SPEC_OPTIONS =
+      TreePVector.from(Arrays.asList(
+          emptyMapStringToObject.plus("dateStyle", "short").plus("timeStyle", "short"),
+          emptyMapStringToObject.plus("dateStyle", "medium").plus("timeStyle", "medium"),
+          emptyMapStringToObject.plus("dateStyle", "long").plus("timeStyle", "long"),
+          emptyMapStringToObject.plus("dateStyle", "full").plus("timeStyle", "full"),
+          emptyMapStringToObject.plus("dateStyle", "full").plus("timeStyle", "short"),
+          emptyMapStringToObject.plus("dateStyle", "long"),
+          emptyMapStringToObject.plus("timeStyle", "long"),
+          emptyMapStringToObject.plus("hour", "numeric"),
+          emptyMapStringToObject.plus("hour", "numeric").plus("minute", "numeric"),
+          emptyMapStringToObject.plus("hour", "numeric").plus("minute", "numeric")
+              .plus("second", "numeric"),
+          emptyMapStringToObject.plus("hour", "numeric").plus("minute", "numeric")
+              .plus("second", "numeric").plus("fractionalSecondDigits", 1),
+          emptyMapStringToObject.plus("hour", "numeric").plus("minute", "numeric")
+              .plus("second", "numeric").plus("fractionalSecondDigits", 2),
+          emptyMapStringToObject.plus("hour", "numeric").plus("minute", "numeric")
+              .plus("second", "numeric").plus("fractionalSecondDigits", 3),
+          emptyMapStringToObject.plus("hour", "numeric").plus("minute", "numeric")
+              .plus("second", "numeric"),
+          emptyMapStringToObject.plus("month", "numeric").plus("weekday", "long")
+              .plus("day", "numeric"),
+          emptyMapStringToObject.plus("month", "2-digit").plus("weekday", "long")
+              .plus("day", "numeric"),
+          emptyMapStringToObject.plus("month", "long").plus("weekday", "long").plus("day", "numeric"),
+          emptyMapStringToObject.plus("month", "short").plus("weekday", "long")
+              .plus("day", "numeric"),
+          emptyMapStringToObject.plus("month", "narrow").plus("weekday", "long")
+              .plus("day", "numeric"),
+          emptyMapStringToObject.plus("month", "short").plus("weekday", "short")
+              .plus("day", "numeric"),
+          emptyMapStringToObject.plus("month", "short").plus("weekday", "narrow")
+              .plus("day", "numeric"),
+          emptyMapStringToObject.plus("era", "long"),
+          emptyMapStringToObject.plus("era", "short"),
+          emptyMapStringToObject.plus("era", "narrow"),
+          emptyMapStringToObject.plus("timeZoneName", "long"),
+          emptyMapStringToObject.plus("timeZoneName", "short"),
+          emptyMapStringToObject.plus("timeZoneName", "shortOffset"),
+          emptyMapStringToObject.plus("timeZoneName", "longOffset"),
+          emptyMapStringToObject.plus("timeZoneName", "shortGeneric"),
+          emptyMapStringToObject.plus("timeZoneName", "longGeneric")
+      ));
+
+  private static final PVector<String> CALENDARS =
+      TreePVector.from(Arrays.asList(
+          "gregory",
+          "buddhist", "hebrew", "chinese", "roc", "japanese",
+          "islamic", "islamic-umalqura", "persian"
+      ));
+
+  private static final PVector<String> TIME_ZONES =
+      TreePVector.from(Arrays.asList(
+          "America/Los_Angeles",
+          "Africa/Luanda",
+          "Asia/Tehran",
+          "Europe/Kiev",
+          "Australia/Brisbane",
+          "Pacific/Palau",
+          "America/Montevideo"
+      ));
+
+
+  public static void main(String[] args) throws IOException {
+    try (TempPrintWriter pw =
+        TempPrintWriter.openUTF8Writer(
+            CLDRPaths.TEST_DATA + OUTPUT_SUBDIR, OUTPUT_FILENAME)) {
+
+
+
+    }
+  }
+
+}
diff --git a/tools/pom.xml b/tools/pom.xml
index 7f629fa02a8..6e3b84ec79f 100644
--- a/tools/pom.xml
+++ b/tools/pom.xml
@@ -190,6 +190,13 @@
 				<artifactId>semver4j</artifactId>
 				<version>3.1.0</version>
 			</dependency>
+
+			<!-- persistent data structures -->
+			<dependency>
+				<groupId>org.pcollections</groupId>
+				<artifactId>pcollections</artifactId>
+				<version>2.1.2</version>
+			</dependency>
 		</dependencies>
 	</dependencyManagement>