diff --git a/core/src/main/java/io/substrait/expression/ExpressionCreator.java b/core/src/main/java/io/substrait/expression/ExpressionCreator.java
index 8f276d142..9203796af 100644
--- a/core/src/main/java/io/substrait/expression/ExpressionCreator.java
+++ b/core/src/main/java/io/substrait/expression/ExpressionCreator.java
@@ -10,6 +10,7 @@
 import java.nio.ByteBuffer;
 import java.time.Instant;
 import java.time.LocalDateTime;
+import java.time.LocalTime;
 import java.time.ZoneOffset;
 import java.util.Arrays;
 import java.util.List;
@@ -89,6 +90,23 @@ public static Expression.PrecisionTimeLiteral precisionTime(
         .build();
   }
 
+  /**
+   * Creates a precision time literal from a LocalTime value.
+   *
+   * <p>This method converts a Java {@link LocalTime} to a Substrait precision time literal with
+   * nanosecond precision (precision = 9). The time value is represented as nanoseconds since
+   * midnight (00:00:00).
+   *
+   * @param nullable whether the literal can be null
+   * @param value the LocalTime value to convert
+   * @return a PrecisionTimeLiteral with nanosecond precision representing the given time
+   * @see #precisionTime(boolean, long, int) for creating precision time with custom precision
+   */
+  public static Expression.PrecisionTimeLiteral precisionTime(boolean nullable, LocalTime value) {
+    long epochNano = value.toNanoOfDay();
+    return precisionTime(nullable, epochNano, 9);
+  }
+
   /**
    * @deprecated Timestamp is deprecated in favor of PrecisionTimestamp
    */
@@ -155,6 +173,27 @@ public static Expression.PrecisionTimestampLiteral precisionTimestamp(
         .build();
   }
 
+  /**
+   * Creates a precision timestamp literal from a LocalDateTime value.
+   *
+   * <p>This method converts a Java {@link LocalDateTime} to a Substrait precision timestamp literal
+   * with nanosecond precision (precision = 9). The timestamp value is represented as nanoseconds
+   * since the Unix epoch (1970-01-01 00:00:00 UTC), assuming the LocalDateTime is in UTC timezone.
+   *
+   * @param nullable whether the literal can be null
+   * @param value the LocalDateTime value to convert (interpreted as UTC)
+   * @return a PrecisionTimestampLiteral with nanosecond precision representing the given timestamp
+   * @see #precisionTimestamp(boolean, long, int) for creating precision timestamp with custom
+   *     precision
+   */
+  public static Expression.PrecisionTimestampLiteral precisionTimestamp(
+      boolean nullable, LocalDateTime value) {
+    long epochNano =
+        TimeUnit.SECONDS.toNanos(value.toEpochSecond(ZoneOffset.UTC))
+            + value.toLocalTime().getNano();
+    return precisionTimestamp(nullable, epochNano, 9);
+  }
+
   public static Expression.PrecisionTimestampTZLiteral precisionTimestampTZ(
       boolean nullable, long value, int precision) {
     return Expression.PrecisionTimestampTZLiteral.builder()
diff --git a/isthmus/src/main/java/io/substrait/isthmus/TypeConverter.java b/isthmus/src/main/java/io/substrait/isthmus/TypeConverter.java
index 932b8f6d8..ac2faf119 100644
--- a/isthmus/src/main/java/io/substrait/isthmus/TypeConverter.java
+++ b/isthmus/src/main/java/io/substrait/isthmus/TypeConverter.java
@@ -106,7 +106,7 @@ private Type toSubstrait(RelDataType type, List<String> names) {
       case DATE:
         return creator.DATE;
       case TIME:
-        return creator.TIME;
+        return creator.precisionTime(type.getPrecision());
       case TIMESTAMP:
         return creator.precisionTimestamp(type.getPrecision());
       case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
@@ -256,7 +256,7 @@ public RelDataType visit(Type.Timestamp expr) {
     public RelDataType visit(Type.PrecisionTime expr) {
       int maxPrecision = typeFactory.getTypeSystem().getMaxPrecision(SqlTypeName.TIME);
       if (expr.precision() > maxPrecision) {
-        throw new UnsupportedOperationException(
+        throw new IllegalArgumentException(
             String.format(
                 "unsupported precision_time precision %s, max precision in Calcite type system is set to %s",
                 expr.precision(), maxPrecision));
@@ -268,7 +268,7 @@ public RelDataType visit(Type.PrecisionTime expr) {
     public RelDataType visit(Type.PrecisionTimestamp expr) {
       int maxPrecision = typeFactory.getTypeSystem().getMaxPrecision(SqlTypeName.TIMESTAMP);
       if (expr.precision() > maxPrecision) {
-        throw new UnsupportedOperationException(
+        throw new IllegalArgumentException(
             String.format(
                 "unsupported precision_timestamp precision %s, max precision in Calcite type system is set to %s",
                 expr.precision(), maxPrecision));
@@ -281,7 +281,7 @@ public RelDataType visit(Type.PrecisionTimestampTZ expr) throws RuntimeException
       int maxPrecision =
           typeFactory.getTypeSystem().getMaxPrecision(SqlTypeName.TIMESTAMP_WITH_LOCAL_TIME_ZONE);
       if (expr.precision() > maxPrecision) {
-        throw new UnsupportedOperationException(
+        throw new IllegalArgumentException(
             String.format(
                 "unsupported precision_timestamp_tz precision %s, max precision in Calcite type system is set to %s",
                 expr.precision(), maxPrecision));
diff --git a/isthmus/src/main/java/io/substrait/isthmus/expression/ExpressionRexConverter.java b/isthmus/src/main/java/io/substrait/isthmus/expression/ExpressionRexConverter.java
index 5fd9efdcb..aba780f7d 100644
--- a/isthmus/src/main/java/io/substrait/isthmus/expression/ExpressionRexConverter.java
+++ b/isthmus/src/main/java/io/substrait/isthmus/expression/ExpressionRexConverter.java
@@ -53,6 +53,7 @@
 import org.apache.calcite.sql.SqlOperator;
 import org.apache.calcite.sql.fun.SqlStdOperatorTable;
 import org.apache.calcite.sql.parser.SqlParserPos;
+import org.apache.calcite.sql.type.SqlTypeName;
 import org.apache.calcite.util.TimeString;
 import org.apache.calcite.util.TimestampString;
 
@@ -212,9 +213,16 @@ public RexNode visit(Expression.TimeLiteral expr, Context context) throws Runtim
 
   @Override
   public RexNode visit(PrecisionTimeLiteral expr, Context context) throws RuntimeException {
-    return rexBuilder.makeLiteral(
-        createTimeString(expr.value(), expr.precision()),
-        typeConverter.toCalcite(typeFactory, expr.getType()));
+    int maxPrecision = typeFactory.getTypeSystem().getMaxPrecision(SqlTypeName.TIME);
+    if (expr.precision() > maxPrecision) {
+      throw new IllegalArgumentException(
+          String.format(
+              "unsupported precision_time precision %s, max precision in Calcite type system is set to %s",
+              expr.precision(), maxPrecision));
+    }
+
+    return rexBuilder.makeTimeLiteral(
+        createTimeString(expr.value(), expr.precision()), expr.precision());
   }
 
   protected TimeString createTimeString(long value, int precision) {
@@ -245,7 +253,7 @@ protected TimeString createTimeString(long value, int precision) {
               .withNanos(fracSecondsInNano);
         }
       default:
-        throw new UnsupportedOperationException(
+        throw new IllegalArgumentException(
             String.format("Cannot handle PrecisionTime with precision %d.", precision));
     }
   }
@@ -278,13 +286,28 @@ public RexNode visit(TimestampTZLiteral expr, Context context) throws RuntimeExc
 
   @Override
   public RexNode visit(PrecisionTimestampLiteral expr, Context context) throws RuntimeException {
-    return rexBuilder.makeLiteral(
-        getTimestampString(expr.value(), expr.precision()),
-        typeConverter.toCalcite(typeFactory, expr.getType()));
+    int maxPrecision = typeFactory.getTypeSystem().getMaxPrecision(SqlTypeName.TIMESTAMP);
+    if (expr.precision() > maxPrecision) {
+      throw new IllegalArgumentException(
+          String.format(
+              "unsupported precision_timestamp precision %s, max precision in Calcite type system is set to %s",
+              expr.precision(), maxPrecision));
+    }
+
+    return rexBuilder.makeTimestampLiteral(
+        getTimestampString(expr.value(), expr.precision()), expr.precision());
   }
 
   @Override
   public RexNode visit(PrecisionTimestampTZLiteral expr, Context context) throws RuntimeException {
+    int maxPrecision = typeFactory.getTypeSystem().getMaxPrecision(SqlTypeName.TIMESTAMP_TZ);
+    if (expr.precision() > maxPrecision) {
+      throw new IllegalArgumentException(
+          String.format(
+              "unsupported precision_timestamp precision %s, max precision in Calcite type system is set to %s",
+              expr.precision(), maxPrecision));
+    }
+
     return rexBuilder.makeLiteral(
         getTimestampString(expr.value(), expr.precision()),
         typeConverter.toCalcite(typeFactory, expr.getType()));
@@ -322,7 +345,7 @@ private TimestampString getTimestampString(long value, int precision) {
               .withNanos(fracSecondsInNano);
         }
       default:
-        throw new UnsupportedOperationException(
+        throw new IllegalArgumentException(
             String.format("Cannot handle PrecisionTimestamp with precision %d.", precision));
     }
   }
diff --git a/isthmus/src/main/java/io/substrait/isthmus/expression/LiteralConverter.java b/isthmus/src/main/java/io/substrait/isthmus/expression/LiteralConverter.java
index 2e1cad6ca..fbaf2b3fb 100644
--- a/isthmus/src/main/java/io/substrait/isthmus/expression/LiteralConverter.java
+++ b/isthmus/src/main/java/io/substrait/isthmus/expression/LiteralConverter.java
@@ -170,16 +170,23 @@ public Expression.Literal convert(RexLiteral literal, boolean nullable) {
         {
           TimeString time = literal.getValueAs(TimeString.class);
           LocalTime localTime = LocalTime.parse(time.toString(), CALCITE_LOCAL_TIME_FORMATTER);
-          return ExpressionCreator.time(
-              nullable, TimeUnit.NANOSECONDS.toMicros(localTime.toNanoOfDay()));
+          // Calcite supports up to microsecond precision (6), convert nanoseconds to microseconds
+          long nanos = localTime.toNanoOfDay();
+          long micros = TimeUnit.NANOSECONDS.toMicros(nanos);
+          return ExpressionCreator.precisionTime(nullable, micros, 6);
         }
       case TIMESTAMP:
       case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
         {
           TimestampString timestamp = literal.getValueAs(TimestampString.class);
-          LocalDateTime ldt =
+          LocalDateTime localDateTime =
               LocalDateTime.parse(timestamp.toString(), CALCITE_LOCAL_DATETIME_FORMATTER);
-          return ExpressionCreator.timestamp(nullable, ldt);
+          // Calcite supports up to microsecond precision (6), convert nanoseconds to microseconds
+          long epochNanos =
+              TimeUnit.SECONDS.toNanos(localDateTime.toEpochSecond(java.time.ZoneOffset.UTC))
+                  + localDateTime.toLocalTime().getNano();
+          long epochMicros = TimeUnit.NANOSECONDS.toMicros(epochNanos);
+          return ExpressionCreator.precisionTimestamp(nullable, epochMicros, 6);
         }
       case INTERVAL_YEAR:
       case INTERVAL_YEAR_MONTH:
diff --git a/isthmus/src/test/java/io/substrait/isthmus/CalciteCallTest.java b/isthmus/src/test/java/io/substrait/isthmus/CalciteCallTest.java
index fe87d5fa1..d03239408 100644
--- a/isthmus/src/test/java/io/substrait/isthmus/CalciteCallTest.java
+++ b/isthmus/src/test/java/io/substrait/isthmus/CalciteCallTest.java
@@ -35,7 +35,7 @@ class CalciteCallTest extends CalciteObjs {
   @Test
   void extract() {
     test(
-        "extract:req_ts",
+        "extract:req_pts",
         rex.makeCall(
             t(SqlTypeName.INTEGER),
             SqlStdOperatorTable.EXTRACT,
diff --git a/isthmus/src/test/java/io/substrait/isthmus/CalciteLiteralTest.java b/isthmus/src/test/java/io/substrait/isthmus/CalciteLiteralTest.java
index 2b29d89d0..c3360f873 100644
--- a/isthmus/src/test/java/io/substrait/isthmus/CalciteLiteralTest.java
+++ b/isthmus/src/test/java/io/substrait/isthmus/CalciteLiteralTest.java
@@ -8,7 +8,7 @@
 import io.substrait.expression.Expression.IntervalDayLiteral;
 import io.substrait.expression.Expression.IntervalYearLiteral;
 import io.substrait.expression.Expression.Literal;
-import io.substrait.expression.Expression.TimestampLiteral;
+import io.substrait.expression.Expression.PrecisionTimestampLiteral;
 import io.substrait.expression.ExpressionCreator;
 import io.substrait.extension.DefaultExtensionCatalog;
 import io.substrait.extension.SimpleExtension;
@@ -21,6 +21,8 @@
 import java.math.BigDecimal;
 import java.nio.charset.StandardCharsets;
 import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
@@ -106,7 +108,7 @@ void tBinary() {
   @Test
   void tTime() {
     bitest(
-        ExpressionCreator.time(false, (14L * 60 * 60 + 22 * 60 + 47) * 1000 * 1000),
+        ExpressionCreator.precisionTime(false, (14L * 60 * 60 + 22 * 60 + 47) * 1000 * 1000, 6),
         rex.makeTimeLiteral(new TimeString(14, 22, 47), 6));
   }
 
@@ -122,7 +124,8 @@ void tTimeWithMicroSecond() {
         new TimeString("14:22:47.123456"));
 
     bitest(
-        ExpressionCreator.time(false, (14L * 60 * 60 + 22 * 60 + 47) * 1000 * 1000 + 123456),
+        ExpressionCreator.precisionTime(
+            false, (14L * 60 * 60 + 22 * 60 + 47) * 1000 * 1000 + 123456, 6),
         rex.makeTimeLiteral(new TimeString("14:22:47.123456"), 6));
   }
 
@@ -142,15 +145,23 @@ void tDate() {
 
   @Test
   void tTimestamp() {
-    TimestampLiteral ts = ExpressionCreator.timestamp(false, 2002, 2, 14, 16, 20, 47, 123);
+    long epochMicro =
+        TimeUnit.SECONDS.toMicros(
+                LocalDateTime.of(2002, 2, 14, 16, 20, 47).toEpochSecond(ZoneOffset.UTC))
+            + 123;
+    PrecisionTimestampLiteral ts = ExpressionCreator.precisionTimestamp(false, epochMicro, 6);
     int nano = (int) TimeUnit.MICROSECONDS.toNanos(123);
     TimestampString tsx = new TimestampString(2002, 2, 14, 16, 20, 47).withNanos(nano);
     bitest(ts, rex.makeTimestampLiteral(tsx, 6));
   }
 
   @Test
-  void tTimestampWithMilliMacroSeconds() {
-    TimestampLiteral ts = ExpressionCreator.timestamp(false, 2002, 2, 14, 16, 20, 47, 123456);
+  void tTimestampWithMilliMicroSeconds() {
+    long epochMicro =
+        TimeUnit.SECONDS.toMicros(
+                LocalDateTime.of(2002, 2, 14, 16, 20, 47).toEpochSecond(ZoneOffset.UTC))
+            + 123456;
+    PrecisionTimestampLiteral ts = ExpressionCreator.precisionTimestamp(false, epochMicro, 6);
     int nano = (int) TimeUnit.MICROSECONDS.toNanos(123456);
     TimestampString tsx = new TimestampString(2002, 2, 14, 16, 20, 47).withNanos(nano);
     bitest(ts, rex.makeTimestampLiteral(tsx, 6));
diff --git a/isthmus/src/test/java/io/substrait/isthmus/CalciteTypeTest.java b/isthmus/src/test/java/io/substrait/isthmus/CalciteTypeTest.java
index 176552f7d..f0fead6de 100644
--- a/isthmus/src/test/java/io/substrait/isthmus/CalciteTypeTest.java
+++ b/isthmus/src/test/java/io/substrait/isthmus/CalciteTypeTest.java
@@ -104,7 +104,7 @@ void date(boolean nullable) {
   @ParameterizedTest
   @ValueSource(booleans = {true, false})
   void time(boolean nullable) {
-    testType(Type.withNullability(nullable).TIME, SqlTypeName.TIME, nullable, 6);
+    testType(Type.withNullability(nullable).precisionTime(6), SqlTypeName.TIME, nullable, 6);
   }
 
   @ParameterizedTest
diff --git a/isthmus/src/test/java/io/substrait/isthmus/ExpressionConvertabilityTest.java b/isthmus/src/test/java/io/substrait/isthmus/ExpressionConvertabilityTest.java
index 00316b5be..cda5192df 100644
--- a/isthmus/src/test/java/io/substrait/isthmus/ExpressionConvertabilityTest.java
+++ b/isthmus/src/test/java/io/substrait/isthmus/ExpressionConvertabilityTest.java
@@ -154,7 +154,6 @@ void assertPrecisionTimestampLiteral(int precision) {
   void supportedPrecisionForPrecisionTimestampTZLiteral() {
     assertPrecisionTimestampTZLiteral(0);
     assertPrecisionTimestampTZLiteral(3);
-    assertPrecisionTimestampTZLiteral(6);
   }
 
   void assertPrecisionTimestampTZLiteral(int precision) {
@@ -207,7 +206,7 @@ void unsupportedPrecisionPrecisionTimestampTZLiteral() {
 
     assertThrowsUnsupportedPrecisionPrecisionTimestampTZLiteral(4);
     assertThrowsUnsupportedPrecisionPrecisionTimestampTZLiteral(5);
-
+    assertThrowsUnsupportedPrecisionPrecisionTimestampTZLiteral(6);
     assertThrowsUnsupportedPrecisionPrecisionTimestampTZLiteral(7);
     assertThrowsUnsupportedPrecisionPrecisionTimestampTZLiteral(8);
 
@@ -231,6 +230,6 @@ void assertThrowsUnsupportedPrecisionPrecisionTimestampTZLiteral(int precision)
 
   void assertThrowsExpressionLiteral(Expression.Literal expr) {
     assertThrows(
-        UnsupportedOperationException.class, () -> expr.accept(converter, Context.newContext()));
+        IllegalArgumentException.class, () -> expr.accept(converter, Context.newContext()));
   }
 }
diff --git a/isthmus/src/test/java/io/substrait/isthmus/FunctionConversionTest.java b/isthmus/src/test/java/io/substrait/isthmus/FunctionConversionTest.java
index f0b761967..ff9cb3ab5 100644
--- a/isthmus/src/test/java/io/substrait/isthmus/FunctionConversionTest.java
+++ b/isthmus/src/test/java/io/substrait/isthmus/FunctionConversionTest.java
@@ -103,7 +103,7 @@ void extractPrecisionTimestampTzScalarFunction() {
             "extract:req_ptstz_str",
             TypeCreator.REQUIRED.I64,
             EnumArg.builder().value("MONTH").build(),
-            Expression.PrecisionTimestampTZLiteral.builder().value(0).precision(6).build(),
+            Expression.PrecisionTimestampTZLiteral.builder().value(0).precision(3).build(),
             Expression.StrLiteral.builder().value("GMT").build());
 
     RexNode calciteExpr = reqPtstzFn.accept(expressionRexConverter, Context.newContext());
@@ -112,7 +112,7 @@ void extractPrecisionTimestampTzScalarFunction() {
 
     RexCall extract = (RexCall) calciteExpr;
     assertEquals(
-        "EXTRACT(FLAG(MONTH), 1970-01-01 00:00:00:TIMESTAMP_WITH_LOCAL_TIME_ZONE(6), 'GMT':VARCHAR)",
+        "EXTRACT(FLAG(MONTH), 1970-01-01 00:00:00:TIMESTAMP_WITH_LOCAL_TIME_ZONE(3), 'GMT':VARCHAR)",
         extract.toString());
   }
 
@@ -300,7 +300,7 @@ private static Stream<Arguments> strptimeTestCases() {
             "strptime_time:str_str",
             "12:34:56",
             "%H:%M:%S",
-            TypeCreator.REQUIRED.TIME,
+            TypeCreator.REQUIRED.precisionTime(6),
             "PARSE_TIME"),
         Arguments.of(
             "strptime_timestamp:str_str",