diff --git a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/config/MultiLangDaemonConfiguration.java b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/config/MultiLangDaemonConfiguration.java
index ed48ac276..da280ddf0 100644
--- a/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/config/MultiLangDaemonConfiguration.java
+++ b/amazon-kinesis-client-multilang/src/main/java/software/amazon/kinesis/multilang/config/MultiLangDaemonConfiguration.java
@@ -19,6 +19,7 @@
 import java.net.URI;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.Date;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -27,6 +28,7 @@
 import java.util.function.Function;
 
 import org.apache.commons.beanutils.BeanUtilsBean;
+import org.apache.commons.beanutils.ConvertUtils;
 import org.apache.commons.beanutils.ConvertUtilsBean;
 import org.apache.commons.beanutils.Converter;
 import org.apache.commons.beanutils.converters.ArrayConverter;
@@ -197,6 +199,14 @@ public MultiLangDaemonConfiguration(BeanUtilsBean utilsBean, ConvertUtilsBean co
         this.utilsBean = utilsBean;
         this.convertUtilsBean = convertUtilsBean;
 
+        convertUtilsBean.register(new Converter() {
+            @Override
+            public <T> T convert(Class<T> type, Object value) {
+                Date date = new Date(Long.parseLong(value.toString()) * 1000L);
+                return type.cast(InitialPositionInStreamExtended.newInitialPositionAtTimestamp(date));
+            }
+        }, InitialPositionInStreamExtended.class);
+
         convertUtilsBean.register(new Converter() {
             @Override
             public <T> T convert(Class<T> type, Object value) {
diff --git a/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/config/KinesisClientLibConfiguratorTest.java b/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/config/KinesisClientLibConfiguratorTest.java
index 685d83dcc..031fc4272 100644
--- a/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/config/KinesisClientLibConfiguratorTest.java
+++ b/amazon-kinesis-client-multilang/src/test/java/software/amazon/kinesis/multilang/config/KinesisClientLibConfiguratorTest.java
@@ -27,15 +27,15 @@
 import java.io.InputStream;
 import java.net.URI;
 import java.util.Arrays;
+import java.util.Date;
 import java.util.HashSet;
-import java.util.Optional;
 import java.util.Set;
 
 import com.amazonaws.auth.AWSCredentials;
 import com.amazonaws.auth.AWSCredentialsProvider;
 import com.amazonaws.auth.BasicAWSCredentials;
 import org.apache.commons.lang3.StringUtils;
-import org.junit.Ignore;
+import org.apache.commons.lang3.exception.ExceptionUtils;
 import org.junit.Rule;
 import org.junit.Test;
 
@@ -45,11 +45,8 @@
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
-import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
-import software.amazon.awssdk.auth.credentials.AwsCredentials;
 import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
 import software.amazon.kinesis.common.InitialPositionInStream;
-import software.amazon.kinesis.coordinator.KinesisClientLibConfiguration;
 import software.amazon.kinesis.metrics.MetricsLevel;
 import software.amazon.kinesis.processor.ShardRecordProcessorFactory;
 
@@ -93,6 +90,47 @@ public void testWithLongVariables() {
         assertEquals(config.getShardSyncIntervalMillis(), 500);
     }
 
+    @Test
+    public void testWithInitialPositionInStreamExtended() {
+        long epochTimeInSeconds = 1617406032;
+        MultiLangDaemonConfiguration config = getConfiguration(StringUtils.join(new String[] { "applicationName = app",
+                "streamName = 123", "AWSCredentialsProvider = " + credentialName1 + ", " + credentialName2,
+                "initialPositionInStreamExtended = " + epochTimeInSeconds}, '\n'));
+
+        assertEquals(config.getInitialPositionInStreamExtended().getTimestamp(), new Date(epochTimeInSeconds * 1000L));
+        assertEquals(config.getInitialPositionInStream(), InitialPositionInStream.AT_TIMESTAMP);
+    }
+
+    @Test
+    public void testInvalidInitialPositionInStream() {
+        // AT_TIMESTAMP cannot be used as initialPositionInStream. If a user wants to specify AT_TIMESTAMP,
+        // they must specify the time with initialPositionInStreamExtended.
+        try {
+            getConfiguration(StringUtils.join(new String[] { "applicationName = app",
+            "streamName = 123", "AWSCredentialsProvider = " + credentialName1 + ", " + credentialName2,
+            "initialPositionInStream = AT_TIMESTAMP"}, '\n'));
+            fail("Should have thrown when initialPositionInStream is set to AT_TIMESTAMP");
+        } catch (Exception e) {
+            Throwable rootCause = ExceptionUtils.getRootCause(e);
+            assertTrue(rootCause instanceof IllegalArgumentException);
+        }
+    }
+
+    @Test
+    public void testInvalidInitialPositionInStreamExtended() {
+        // initialPositionInStreamExtended takes a long value indicating seconds since epoch. If a non-long
+        // value is provided, the constructor should throw an IllegalArgumentException exception.
+        try {
+            getConfiguration(StringUtils.join(new String[] { "applicationName = app",
+            "streamName = 123", "AWSCredentialsProvider = " + credentialName1 + ", " + credentialName2,
+            "initialPositionInStreamExtended = null"}, '\n'));
+            fail("Should have thrown when initialPositionInStreamExtended is set to null");
+        } catch (Exception e) {
+            Throwable rootCause = ExceptionUtils.getRootCause(e);
+            assertTrue(rootCause instanceof IllegalArgumentException);
+        }
+    }
+
     @Test
     public void testWithUnsupportedClientConfigurationVariables() {
         MultiLangDaemonConfiguration config = getConfiguration(StringUtils.join(
@@ -159,7 +197,7 @@ public void testWithSetVariables() {
     }
 
     @Test
-    public void testWithInitialPositionInStreamVariables() {
+    public void testWithInitialPositionInStreamTrimHorizon() {
         MultiLangDaemonConfiguration config = getConfiguration(StringUtils.join(new String[] { "streamName = a",
                 "applicationName = b", "AWSCredentialsProvider = ABCD," + credentialName1, "workerId = 123",
                 "initialPositionInStream = TriM_Horizon" }, '\n'));
@@ -167,6 +205,15 @@ public void testWithInitialPositionInStreamVariables() {
         assertEquals(config.getInitialPositionInStream(), InitialPositionInStream.TRIM_HORIZON);
     }
 
+    @Test
+    public void testWithInitialPositionInStreamLatest() {
+        MultiLangDaemonConfiguration config = getConfiguration(StringUtils.join(new String[] { "streamName = a",
+                "applicationName = b", "AWSCredentialsProvider = ABCD," + credentialName1, "workerId = 123",
+                "initialPositionInStream = LateSt" }, '\n'));
+
+        assertEquals(config.getInitialPositionInStream(), InitialPositionInStream.LATEST);
+    }
+
     @Test
     public void testSkippingNonKCLVariables() {
         MultiLangDaemonConfiguration config = getConfiguration(StringUtils.join(new String[] { "streamName = a",