8351064: JFR: Consistent timestamps

Reviewed-by: mgronlun

Author: egahlin

src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/ChunkParser.java

@@ -127,7 +127,11 @@ private ChunkParser(ChunkHeader header, ChunkParser previous, ParserConfiguratio
             this.configuration = previous.configuration;
         }
         this.metadata = header.readMetadata(previousMetadata);
-        this.timeConverter = new TimeConverter(chunkHeader, metadata.getGMTOffset() + metadata.getDST());
+        if (previous == null) {
+            this.timeConverter = new TimeConverter(chunkHeader, metadata.getGMTOffset() + metadata.getDST());
+        } else {
+            this.timeConverter = previous.timeConverter;
+        }
         if (metadata != previousMetadata) {
             ParserFactory factory = new ParserFactory(metadata, constantLookups, timeConverter);
             parsers = factory.getParsers();