diff --git a/partiql-spi/src/main/java/org/partiql/spi/stream/PSink.java b/partiql-spi/src/main/java/org/partiql/spi/stream/PSink.java
index 495a0a482..95665bcf9 100644
--- a/partiql-spi/src/main/java/org/partiql/spi/stream/PSink.java
+++ b/partiql-spi/src/main/java/org/partiql/spi/stream/PSink.java
@@ -2,11 +2,13 @@
 
 import org.jetbrains.annotations.NotNull;
 import org.partiql.types.PType;
-import org.partiql.value.datetime.Date;
-import org.partiql.value.datetime.Time;
-import org.partiql.value.datetime.Timestamp;
 
 import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.time.OffsetDateTime;
+import java.time.OffsetTime;
 
 /**
  * This is a PartiQL value stream sink.
@@ -115,27 +117,27 @@ default void flush() {
     /**
      * Write DATE value.
      */
-    void writeDate(@NotNull Date value);
+    void writeDate(@NotNull LocalDate value);
 
     /**
      * Write TIME value.
      */
-    void writeTime(@NotNull Time value);
+    void writeTime(@NotNull LocalTime value);
 
     /**
      * Write TIMEZ value.
      */
-    void writeTimez(@NotNull Time value);
+    void writeTimez(@NotNull OffsetTime value);
 
     /**
      * Write TIMESTAMP value.
      */
-    void writeTimestamp(@NotNull Timestamp value);
+    void writeTimestamp(@NotNull LocalDateTime value);
 
     /**
      * Write TIMESTAMPZ with given precision.
      */
-    void writeTimestampz(@NotNull Timestamp value);
+    void writeTimestampz(@NotNull OffsetDateTime value);
 
     /**
      * Write a VARIANT type.
diff --git a/partiql-spi/src/main/kotlin/org/partiql/spi/value/ion/IonSink.kt b/partiql-spi/src/main/kotlin/org/partiql/spi/value/ion/IonSink.kt
index eb0eb2e7d..23e70047e 100644
--- a/partiql-spi/src/main/kotlin/org/partiql/spi/value/ion/IonSink.kt
+++ b/partiql-spi/src/main/kotlin/org/partiql/spi/value/ion/IonSink.kt
@@ -2,16 +2,19 @@ package org.partiql.spi.value.ion
 
 import com.amazon.ion.IonType
 import com.amazon.ion.IonWriter
+import com.amazon.ion.Timestamp
 import com.amazon.ion.system.IonBinaryWriterBuilder
 import com.amazon.ion.system.IonTextWriterBuilder
 import org.partiql.spi.stream.PSink
 import org.partiql.types.PType
-import org.partiql.value.datetime.Date
-import org.partiql.value.datetime.Time
-import org.partiql.value.datetime.Timestamp
 import java.io.OutputStream
 import java.lang.Double.parseDouble
 import java.math.BigDecimal
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.LocalTime
+import java.time.OffsetDateTime
+import java.time.OffsetTime
 import java.util.BitSet
 
 /**
@@ -243,24 +246,44 @@ public class IonSink : PSink {
         this.writer.writeClob(value)
     }
 
-    override fun writeDate(value: Date) {
-        TODO("datetime blocked on https://github.com/partiql/partiql-lang-kotlin/pull/1656")
+    override fun writeDate(value: LocalDate) {
+        if (elisions[PType.DATE]) {
+            this.writer.setTypeAnnotations()
+        }
+        val iso8601 = value.toString()
+        this.writer.writeString(iso8601)
     }
 
-    override fun writeTime(value: Time) {
-        TODO("datetime blocked on https://github.com/partiql/partiql-lang-kotlin/pull/1656")
+    override fun writeTime(value: LocalTime) {
+        if (elisions[PType.TIME]) {
+            this.writer.setTypeAnnotations()
+        }
+        val iso8601 = value.toString()
+        this.writer.writeString(iso8601)
     }
 
-    override fun writeTimez(value: Time) {
-        TODO("datetime blocked on https://github.com/partiql/partiql-lang-kotlin/pull/1656")
+    override fun writeTimez(value: OffsetTime) {
+        if (elisions[PType.TIMEZ]) {
+            this.writer.setTypeAnnotations()
+        }
+        val iso8601 = value.toString()
+        this.writer.writeString(iso8601)
     }
 
-    override fun writeTimestamp(value: Timestamp) {
-        TODO("datetime blocked on https://github.com/partiql/partiql-lang-kotlin/pull/1656")
+    override fun writeTimestamp(value: LocalDateTime) {
+        if (elisions[PType.TIMESTAMP]) {
+            this.writer.setTypeAnnotations()
+        }
+        val iso8601 = value.toString()
+        this.writer.writeString(iso8601)
     }
 
-    override fun writeTimestampz(value: Timestamp) {
-        TODO("datetime blocked on https://github.com/partiql/partiql-lang-kotlin/pull/1656")
+    override fun writeTimestampz(value: OffsetDateTime) {
+        if (elisions[PType.TIMESTAMPZ]) {
+            this.writer.setTypeAnnotations()
+        }
+        val iso8601 = value.toString()
+        this.writer.writeString(iso8601)
     }
 
     override fun <T : Any> writeVariant(value: T) {
diff --git a/partiql-spi/src/test/kotlin/org/partiql/spi/value/ion/IonStreamTest.kt b/partiql-spi/src/test/kotlin/org/partiql/spi/value/ion/IonStreamTest.kt
index 0b5f01050..6817e96bd 100644
--- a/partiql-spi/src/test/kotlin/org/partiql/spi/value/ion/IonStreamTest.kt
+++ b/partiql-spi/src/test/kotlin/org/partiql/spi/value/ion/IonStreamTest.kt
@@ -82,7 +82,16 @@ class IonStreamTest {
 
     @Test
     fun testDatetime() {
-        // TODO blocked on https://github.com/partiql/partiql-lang-kotlin/pull/1656
+        // date
+
+        // time
+
+        // timez
+
+        // timestamp
+
+        // timestampz
+        case("'timestamp'::2017-01-01T00:00:00Z", Datum.timestamp(2017, 1, 1, 0, 0, 0, 0, 0))
     }
 
     @Test