Index: trunk/src/org/openstreetmap/josm/io/rtklib/RtkLibPosReader.java
===================================================================
--- trunk/src/org/openstreetmap/josm/io/rtklib/RtkLibPosReader.java	(revision 15249)
+++ trunk/src/org/openstreetmap/josm/io/rtklib/RtkLibPosReader.java	(revision 15250)
@@ -22,4 +22,5 @@
 import org.openstreetmap.josm.io.IGpxReader;
 import org.openstreetmap.josm.tools.Logging;
+import org.openstreetmap.josm.tools.date.DateUtils;
 import org.xml.sax.SAXException;
 
@@ -61,4 +62,5 @@
     public RtkLibPosReader(InputStream source) throws IOException {
         this.source = Objects.requireNonNull(source);
+        dateTimeFmt.setTimeZone(DateUtils.UTC);
     }
 
Index: trunk/src/org/openstreetmap/josm/tools/date/DateUtils.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/date/DateUtils.java	(revision 15249)
+++ trunk/src/org/openstreetmap/josm/tools/date/DateUtils.java	(revision 15250)
@@ -36,5 +36,5 @@
      * The UTC time zone.
      */
-    public static final TimeZone UTC = TimeZone.getTimeZone("UTC");
+    public static final TimeZone UTC = TimeZone.getTimeZone(ZoneOffset.UTC);
 
     /**