diff --git a/services/archive-engine/dbd/postgres_schema.txt b/services/archive-engine/dbd/postgres_schema.txt
index 1649820a49..4947bd3b6c 100644
--- a/services/archive-engine/dbd/postgres_schema.txt
+++ b/services/archive-engine/dbd/postgres_schema.txt
@@ -199,7 +199,7 @@ DROP TABLE IF EXISTS sample;
 CREATE TABLE sample
 (
    channel_id BIGINT NOT NULL,
-   smpl_time TIMESTAMP NOT NULL,
+   smpl_time TIMESTAMPTZ NOT NULL,
    nanosecs BIGINT  NOT NULL,
    severity_id BIGINT NOT NULL,
    status_id BIGINT  NOT NULL,
diff --git a/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/RDBArchiveWriter.java b/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/RDBArchiveWriter.java
index 38c54216ee..516a3f47fa 100644
--- a/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/RDBArchiveWriter.java
+++ b/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/RDBArchiveWriter.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011-2024 Oak Ridge National Laboratory.
+ * Copyright (c) 2011-2025 Oak Ridge National Laboratory.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -51,7 +51,6 @@
  *  @author Lana Abadie - PostgreSQL for original RDBArchive code. Disable autocommit as needed.
  *  @author Laurent Philippe (Use read-only connection when possible for MySQL load balancing)
  */
-@SuppressWarnings("nls")
 public class RDBArchiveWriter implements ArchiveWriter
 {
     /** Status string for <code>Double.NaN</code> samples */
@@ -430,9 +429,8 @@ private void oldBatchDoubleSamples(final RDBWriteChannel channel,
             final int N = additional.size();
             for (int i = 1; i < N; i++)
             {
-                if (dialect == Dialect.Oracle){
-                    insert_array_sample.setTimestamp(2, stamp);
-                }
+                if (dialect == Dialect.Oracle)
+                    insert_array_sample.setObject(2, TimestampHelper.toOffsetDateTime(stamp));
                 else
                 {
                     // Truncate the time stamp
@@ -498,9 +496,8 @@ private void completeAndBatchInsert(
             final Timestamp stamp, final int severity,
             final Status status) throws Exception
     {
-        if (dialect == Dialect.Oracle){
-            insert_xx.setTimestamp(2, stamp);
-        }
+        if (dialect == Dialect.Oracle)
+            insert_xx.setObject(2, TimestampHelper.toOffsetDateTime(stamp));
         else
         {
             // Truncate the time stamp
diff --git a/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/TimestampHelper.java b/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/TimestampHelper.java
index 7c0b865ca9..909d74afbb 100644
--- a/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/TimestampHelper.java
+++ b/services/archive-engine/src/main/java/org/csstudio/archive/writer/rdb/TimestampHelper.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2012-2018 Oak Ridge National Laboratory.
+ * Copyright (c) 2012-2025 Oak Ridge National Laboratory.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -9,9 +9,9 @@
 
 import java.time.Duration;
 import java.time.Instant;
+import java.time.OffsetDateTime;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
-import java.util.Calendar;
 import java.util.concurrent.TimeUnit;
 
 import org.phoebus.util.time.TimestampFormats;
@@ -19,7 +19,6 @@
 /** Time stamp gymnastics
  *  @author Kay Kasemir
  */
-@SuppressWarnings("nls")
 public class TimestampHelper
 {
     /** @param timestamp {@link Instant}, may be <code>null</code>
@@ -32,17 +31,6 @@ public static String format(final Instant timestamp)
         return TimestampFormats.FULL_FORMAT.format(timestamp);
     }
 
-    // May look like just     time_format.format(Instant)  works,
-    // but results in runtime error " java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: YearOfEra"
-    // because time for printing needs to be in local time
-//    public static void main(String[] args)
-//    {
-//      final Instant now = Instant.now();
-//      System.out.println(format(now));
-//      System.out.println(time_format.format(now));
-//    }
-
-
     /** @param timestamp EPICS Timestamp
      *  @return SQL Timestamp
      */
@@ -77,14 +65,29 @@ public static Instant fromMillisecs(final long millisecs)
         }
         return Instant.ofEpochSecond(seconds,  nanoseconds);
     }
-
-    /** @param calendar Calendar
-     *  @return EPICS Timestamp
+    
+    /** Zone ID is something like "America/New_York".
+     *  Within that zone, time might change between
+     *  EDT (daylight saving) and EST (standard),
+     *  but the Zone ID remains, so we can keep it final.
      */
-    public static Instant fromCalendar(final Calendar calendar)
-    {
-        return fromMillisecs(calendar.getTimeInMillis());
-    }
+    final private static ZoneId zone = ZoneId.systemDefault();
+
+    /** Turn SQL {@link java.sql.Timestamp} into {@link OffsetDateTime}
+     *
+     *  Oracle JDBC PreparedStatement.setTimestamp(int, Timestamp)
+     *  will change the zone info in unexpected ways.
+     *  Using PreparedStatement.setObject(int, OffsetDateTime)
+     *  is the suggested workaround, so this morphs a Timestamp
+     *  into OffsetDateTime
+     *
+     *  @param sql_time SQL {@link java.sql.Timestamp}
+     *  @return {@link OffsetDateTime}
+     */
+    public static OffsetDateTime toOffsetDateTime(final java.sql.Timestamp sql_time)
+	{
+		return OffsetDateTime.ofInstant(sql_time.toInstant(), zone);
+	}
 
     /** Round time to next multiple of given duration
      *  @param time Original time stamp