feat: support java.time.OffsetDateTime in post data (#1624)

Fixes https://github.com/microsoft/playwright-java/issues/1623

playwright/src/main/java/com/microsoft/playwright/impl/Serialization.java

@@ -35,10 +35,7 @@ import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
-import java.time.Instant;
-import java.time.LocalDateTime;
-import java.time.ZoneId;
-import java.time.ZoneOffset;
+import java.time.*;
 import java.util.*;
 import java.util.regex.Pattern;
 
@@ -79,6 +76,7 @@ class Serialization {
   static final Gson jsonDataSerializer = new GsonBuilder().disableHtmlEscaping()
     .registerTypeAdapter(Date.class, new DateSerializer())
     .registerTypeAdapter(LocalDateTime.class, new LocalDateTimeSerializer())
+    .registerTypeAdapter(OffsetDateTime.class, new OffsetDateTimeSerializer())
     .serializeNulls().create();
 
   static SerializedError serializeError(Throwable e) {
@@ -519,6 +517,13 @@ class Serialization {
     }
   }
 
+  private static class OffsetDateTimeSerializer implements JsonSerializer<OffsetDateTime> {
+    @Override
+    public JsonElement serialize(OffsetDateTime src, Type typeOfSrc, JsonSerializationContext context) {
+      return new JsonPrimitive(dateFormat.format(Date.from(src.toInstant())));
+    }
+  }
+
   private static class LocalDateTimeSerializer implements JsonSerializer<LocalDateTime> {
     @Override
     public JsonElement serialize(LocalDateTime src, Type typeOfSrc, JsonSerializationContext context) {

playwright/src/test/java/com/microsoft/playwright/TestBrowserContextFetch.java

@@ -28,6 +28,7 @@ import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
 import java.text.ParseException;
 import java.time.LocalDateTime;
+import java.time.OffsetDateTime;
 import java.time.ZoneId;
 import java.util.*;
 import java.util.concurrent.ExecutionException;
@@ -520,6 +521,16 @@ public class TestBrowserContextFetch extends TestBase {
     assertEquals("{\"name\":\"foo\",\"localDateTime\":\"2022-12-23T06:14:58.818Z\",\"date\":\"2022-12-23T06:14:58.818Z\",\"nullLocalDateTime\":null,\"nullDate\":null}",
       new String(req.get().postBody));
   }
+  
+  @Test
+  void shouldSupportOffsetDateTimeInData() throws ExecutionException, InterruptedException {
+    APIRequestContext request = playwright.request().newContext();
+    OffsetDateTime offsetDateTime = OffsetDateTime.parse("2024-07-10T10:15:30-08:00");
+    Future<Server.Request> serverRequest = server.futureRequest("/empty.html");
+    request.get(server.EMPTY_PAGE, RequestOptions.create().setData(mapOf("date", offsetDateTime)));
+    byte[] body = serverRequest.get().postBody;
+    assertEquals("{\"date\":\"2024-07-10T18:15:30.000Z\"}", new String(body));
+  }
 
   @Test
   void shouldSupportApplicationXWwwFormUrlencoded() throws ExecutionException, InterruptedException {