add testcase for issue #2124

core/src/test/java/com/alibaba/fastjson2/issues_2100/Issue2124.java

@@ -0,0 +1,28 @@
+package com.alibaba.fastjson2.issues_2100;
+
+import com.alibaba.fastjson2.*;
+import org.junit.jupiter.api.Test;
+
+import java.time.ZoneId;
+import java.util.Date;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2124 {
+    @Test
+    public void test() {
+        ZoneId zoneId = ZoneId.of("Asia/Karachi");
+
+        JSONWriter.Context writeContext = JSONFactory.createWriteContext();
+        writeContext.setZoneId(zoneId);
+
+        Date date = new Date();
+        String str = JSON.toJSONString(date, writeContext);
+
+        JSONReader.Context readContext = JSONFactory.createReadContext();
+        readContext.setZoneId(zoneId);
+
+        Date date1 = JSON.parseObject(str, Date.class, readContext);
+        assertEquals(date, date1);
+    }
+}