Fix Date.kt:

- Use an Instant internally, as LocalDateTime is lossy in the case of a DST change
- Copied the parser from Android JRE.
- Lots of fixes / adjustments

Enable j2kt in the DateTimeTestSuite

PiperOrigin-RevId: 588012812

jre/javatests/BUILD

@@ -52,8 +52,10 @@ j2kt_native_library(
     srcs = [
         "com/google/j2cl/jre/BigDecimalSuite.java",
         "com/google/j2cl/jre/BigIntegerSuite.java",
+        "com/google/j2cl/jre/DateTimeSuite.java",
         "com/google/j2cl/jre/EmulSuite.java",
         "com/google/j2cl/jre/java/util/ComparatorTest.java",
+        "com/google/j2cl/jre/java/util/DateTest.java",
         "com/google/j2cl/jre/java/util/EmulTestBase.java",
         "com/google/j2cl/jre/java/util/ObjectsTest.java",
         "com/google/j2cl/jre/java/util/RandomTest.java",
@@ -66,6 +68,7 @@ j2kt_native_library(
         "com/google/j2cl/jre/java/math/*.java",
         "com/google/j2cl/jre/java/nio/charset/*.java",
         "com/google/j2cl/jre/java/security/*.java",
+        "com/google/j2cl/jre/java/sql/*.java",
     ]),
     deps = [
         "//jre/java:javaemul_internal_annotations-j2kt-native",
@@ -151,6 +154,7 @@ j2cl_multi_test(
 
 j2cl_multi_test(
     name = "DateTimeSuite",
+    enable_kt_native = True,
     test_class = "com.google.j2cl.jre.DateTimeSuite",
     deps = [":emul_tests_lib"],
 )

jre/javatests/com/google/j2cl/jre/java/sql/SqlTimeTest.java

@@ -15,6 +15,7 @@
  */
 package com.google.j2cl.jre.java.sql;
 
+import com.google.j2cl.jre.testing.J2ktIncompatible;
 import java.sql.Time;
 import junit.framework.TestCase;
 
@@ -79,14 +80,17 @@ public void testUnimplementedFunctions() {
     }
   }
 
-  public void testParse() {
+  @J2ktIncompatible // Not nullable according to Jspecify
+  public void testParseNull() {
     try {
       Time.parse(null);
       fail("Should have thrown exception");
     } catch (IllegalArgumentException e) {
       // Expected
     }
+  }
 
+  public void testParse() {
     try {
       Time.parse("");
     } catch (IllegalArgumentException e) {

jre/javatests/com/google/j2cl/jre/java/util/DateTest.java

@@ -15,6 +15,7 @@
  */
 package com.google.j2cl.jre.java.util;
 
+import com.google.j2cl.jre.testing.J2ktIncompatible;
 import com.google.j2cl.jre.testing.TestUtils;
 import java.util.ArrayList;
 import java.util.Date;
@@ -358,15 +359,18 @@ public void testInvalidDateForMonth() {
     assertEquals(dateWithThirtyDays.getDate(), newDayNum - numDaysInOldMonth);
   }
 
-  /** Testing for public static long java.util.Date.parse(java.lang.String). */
-  public void testParse() {
+  @J2ktIncompatible // Not nullable according to Jspecify
+  public void testParseNull() {
     try {
       Date.parse(null);
       fail("Should have thrown exception");
     } catch (IllegalArgumentException e) {
       // Expected
     }
+  }
 
+  /** Testing for public static long java.util.Date.parse(java.lang.String). */
+  public void testParse() {
     try {
       Date.parse("");
     } catch (IllegalArgumentException e) {