diff --git a/ibm-mq-metrics/config.yml b/ibm-mq-metrics/config.yml
index 69e99e6cf..6f2b50e46 100644
--- a/ibm-mq-metrics/config.yml
+++ b/ibm-mq-metrics/config.yml
@@ -186,6 +186,8 @@ metrics:
     enabled: true
   "ibm.mq.heartbeat":  # Queue manager heartbeat
     enabled: true
+  "ibm.mq.queue_manager.uptime":  # Queue manager uptime
+    enabled: true
   "ibm.mq.archive.log.size":  # Queue manager archive log size
     enabled: true
   "ibm.mq.manager.max.active.channels":  # Queue manager max active channels
diff --git a/ibm-mq-metrics/model/metrics.yaml b/ibm-mq-metrics/model/metrics.yaml
index cfdfca3f2..e9cdeaa9c 100644
--- a/ibm-mq-metrics/model/metrics.yaml
+++ b/ibm-mq-metrics/model/metrics.yaml
@@ -533,6 +533,16 @@ groups:
     attributes:
       - ref: ibm.mq.queue.manager
         requirement_level: required
+  - id: ibm.mq.queue_manager.uptime
+    type: metric
+    metric_name: ibm.mq.queue_manager.uptime
+    stability: development
+    brief: "Queue manager uptime"
+    instrument: counter
+    unit: "s"
+    attributes:
+      - ref: ibm.mq.queue.manager
+        requirement_level: required
   - id: ibm.mq.archive.log.size
     type: metric
     metric_name: ibm.mq.archive.log.size
diff --git a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/Metrics.java b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/Metrics.java
index b5c5f3c87..adfe58153 100644
--- a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/Metrics.java
+++ b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/Metrics.java
@@ -360,6 +360,14 @@ public static LongGauge createIbmMqHeartbeat(Meter meter) {
         .build();
   }
 
+  public static LongCounter createIbmMqQueueManagerUptime(Meter meter) {
+    return meter
+        .counterBuilder("ibm.mq.queue_manager.uptime")
+        .setUnit("s")
+        .setDescription("Queue manager uptime")
+        .build();
+  }
+
   public static LongGauge createIbmMqArchiveLogSize(Meter meter) {
     return meter
         .gaugeBuilder("ibm.mq.archive.log.size")
diff --git a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/MetricsConfig.java b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/MetricsConfig.java
index 2b4c09958..f2bc14c85 100644
--- a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/MetricsConfig.java
+++ b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metrics/MetricsConfig.java
@@ -171,6 +171,10 @@ public boolean isIbmMqHeartbeatEnabled() {
     return isEnabled("ibm.mq.heartbeat");
   }
 
+  public boolean isIbmMqQueueManagerUptimeEnabled() {
+    return isEnabled("ibm.mq.queue_manager.uptime");
+  }
+
   public boolean isIbmMqArchiveLogSizeEnabled() {
     return isEnabled("ibm.mq.archive.log.size");
   }
diff --git a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/MessageBuddy.java b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/MessageBuddy.java
index 688f9541d..248190965 100644
--- a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/MessageBuddy.java
+++ b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/MessageBuddy.java
@@ -11,6 +11,8 @@
 import com.ibm.mq.headers.pcf.PCFException;
 import com.ibm.mq.headers.pcf.PCFMessage;
 import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
 
 public final class MessageBuddy {
 
@@ -72,4 +74,29 @@ public static long channelStartTime(PCFMessage message) throws PCFException {
   public static String jobName(PCFMessage message) throws PCFException {
     return message.getStringParameterValue(CMQCFC.MQCACH_MCA_JOB_NAME).trim();
   }
+
+  /**
+   * Calculate the queue manager uptime in seconds.
+   *
+   * <p>Fetches the queue manager start date and time from the PCF response, parses them, and
+   * calculates the difference from the current system time.
+   *
+   * @param message the PCF response message containing queue manager information
+   * @return uptime in seconds since the queue manager started
+   * @throws PCFException if the required attributes cannot be retrieved from the PCF message
+   */
+  public static long queueManagerUptime(PCFMessage message) throws PCFException {
+    String date = message.getStringParameterValue(CMQCFC.MQCACF_Q_MGR_START_DATE).trim();
+    String time = message.getStringParameterValue(CMQCFC.MQCACF_Q_MGR_START_TIME).trim();
+
+    // Parse the date (format: yyyy-MM-dd) and time (format: HH.mm.ss)
+    // The queue manager start timestamp does not include timezone information in this PCF response,
+    // so we normalize to UTC for a stable and predictable baseline across regions.
+    LocalDateTime qmgrStartLocal = LocalDateTime.parse(date + "T" + time.replaceAll("\\.", ":"));
+    Instant qmgrStartInstant = qmgrStartLocal.toInstant(ZoneOffset.UTC);
+    Instant now = Instant.now();
+
+    // Calculate uptime in seconds
+    return now.getEpochSecond() - qmgrStartInstant.getEpochSecond();
+  }
 }
diff --git a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollector.java b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollector.java
index 2b3d57086..e79f6e14f 100644
--- a/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollector.java
+++ b/ibm-mq-metrics/src/main/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollector.java
@@ -11,6 +11,7 @@
 import com.ibm.mq.constants.CMQCFC;
 import com.ibm.mq.headers.pcf.PCFMessage;
 import io.opentelemetry.api.common.Attributes;
+import io.opentelemetry.api.metrics.LongCounter;
 import io.opentelemetry.api.metrics.LongGauge;
 import io.opentelemetry.api.metrics.Meter;
 import io.opentelemetry.ibm.mq.metrics.Metrics;
@@ -30,6 +31,7 @@ public final class QueueManagerMetricsCollector implements Consumer<MetricsColle
   private final LongGauge reuseLogSizeGauge;
   private final LongGauge archiveLogSizeGauge;
   private final LongGauge maxActiveChannelsGauge;
+  private final LongCounter queueManagerUptimeCounter;
 
   public QueueManagerMetricsCollector(Meter meter) {
     this.statusGauge = Metrics.createIbmMqManagerStatus(meter);
@@ -38,6 +40,7 @@ public QueueManagerMetricsCollector(Meter meter) {
     this.reuseLogSizeGauge = Metrics.createIbmMqReusableLogSize(meter);
     this.archiveLogSizeGauge = Metrics.createIbmMqArchiveLogSize(meter);
     this.maxActiveChannelsGauge = Metrics.createIbmMqManagerMaxActiveChannels(meter);
+    this.queueManagerUptimeCounter = Metrics.createIbmMqQueueManagerUptime(meter);
   }
 
   @Override
@@ -91,6 +94,17 @@ public void accept(MetricsCollectorContext context) {
         int maxActiveChannels = context.getQueueManager().getMaxActiveChannels();
         maxActiveChannelsGauge.set(maxActiveChannels, attributes);
       }
+      if (context.getMetricsConfig().isIbmMqQueueManagerUptimeEnabled()) {
+        try {
+          long uptimeSeconds = MessageBuddy.queueManagerUptime(responses.get(0));
+          queueManagerUptimeCounter.add(uptimeSeconds, attributes);
+        } catch (Exception e) {
+          logger.debug(
+              "Unable to calculate queue manager uptime for {}: {}",
+              context.getQueueManagerName(),
+              e.getMessage());
+        }
+      }
     } catch (Exception e) {
       logger.error(e.getMessage());
       throw new IllegalStateException(e);
diff --git a/ibm-mq-metrics/src/test/java/io/opentelemetry/ibm/mq/metricscollector/MessageBuddyTest.java b/ibm-mq-metrics/src/test/java/io/opentelemetry/ibm/mq/metricscollector/MessageBuddyTest.java
new file mode 100644
index 000000000..56615b403
--- /dev/null
+++ b/ibm-mq-metrics/src/test/java/io/opentelemetry/ibm/mq/metricscollector/MessageBuddyTest.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.ibm.mq.metricscollector;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.ibm.mq.constants.CMQCFC;
+import com.ibm.mq.headers.pcf.PCFException;
+import com.ibm.mq.headers.pcf.PCFMessage;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.time.format.DateTimeFormatter;
+import java.util.Locale;
+import java.util.TimeZone;
+import org.junit.jupiter.api.Test;
+
+class MessageBuddyTest {
+
+  private static final DateTimeFormatter DATE_FORMATTER =
+      DateTimeFormatter.ofPattern("yyyy-MM-dd", Locale.ROOT);
+  private static final DateTimeFormatter TIME_FORMATTER =
+      DateTimeFormatter.ofPattern("HH.mm.ss", Locale.ROOT);
+
+  @Test
+  void queueManagerUptimeUsesUtcAndDoesNotDriftWithSystemTimezone() throws PCFException {
+    TimeZone originalTz = TimeZone.getDefault();
+    try {
+      Instant startInstant = Instant.now().minusSeconds(600);
+      LocalDateTime startUtc = LocalDateTime.ofInstant(startInstant, ZoneOffset.UTC);
+      String startDate = startUtc.format(DATE_FORMATTER);
+      String startTime = startUtc.format(TIME_FORMATTER);
+
+      PCFMessage message = new PCFMessage(2, CMQCFC.MQCMD_INQUIRE_Q_MGR_STATUS, 1, true);
+      message.addParameter(CMQCFC.MQCACF_Q_MGR_START_DATE, startDate);
+      message.addParameter(CMQCFC.MQCACF_Q_MGR_START_TIME, startTime);
+
+      TimeZone.setDefault(TimeZone.getTimeZone("Pacific/Kiritimati"));
+      long beforeFirst = Instant.now().getEpochSecond();
+      long firstResult = MessageBuddy.queueManagerUptime(message);
+      long afterFirst = Instant.now().getEpochSecond();
+
+      TimeZone.setDefault(TimeZone.getTimeZone("Pacific/Honolulu"));
+      long beforeSecond = Instant.now().getEpochSecond();
+      long secondResult = MessageBuddy.queueManagerUptime(message);
+      long afterSecond = Instant.now().getEpochSecond();
+
+      long expectedLowerFirst = beforeFirst - startInstant.getEpochSecond();
+      long expectedUpperFirst = afterFirst - startInstant.getEpochSecond();
+      assertThat(firstResult).isBetween(expectedLowerFirst, expectedUpperFirst);
+
+      long expectedLowerSecond = beforeSecond - startInstant.getEpochSecond();
+      long expectedUpperSecond = afterSecond - startInstant.getEpochSecond();
+      assertThat(secondResult).isBetween(expectedLowerSecond, expectedUpperSecond);
+
+      // Changing the JVM default timezone should not materially change uptime when UTC is used.
+      assertThat(Math.abs(firstResult - secondResult)).isLessThanOrEqualTo(2);
+    } finally {
+      TimeZone.setDefault(originalTz);
+    }
+  }
+}
diff --git a/ibm-mq-metrics/src/test/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollectorTest.java b/ibm-mq-metrics/src/test/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollectorTest.java
index 3c6ef1503..d1a785aef 100644
--- a/ibm-mq-metrics/src/test/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollectorTest.java
+++ b/ibm-mq-metrics/src/test/java/io/opentelemetry/ibm/mq/metricscollector/QueueManagerMetricsCollectorTest.java
@@ -5,7 +5,6 @@
 
 package io.opentelemetry.ibm.mq.metricscollector;
 
-import static java.util.Collections.singletonList;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.when;
@@ -20,8 +19,6 @@
 import io.opentelemetry.ibm.mq.opentelemetry.ConfigWrapper;
 import io.opentelemetry.sdk.metrics.data.MetricData;
 import io.opentelemetry.sdk.testing.junit5.OpenTelemetryExtension;
-import java.util.ArrayList;
-import java.util.List;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -58,14 +55,18 @@ void testProcessPCFRequestAndPublishQMetricsForInquireQStatusCmd() throws Except
         new QueueManagerMetricsCollector(
             otelTesting.getOpenTelemetry().getMeter("opentelemetry.io/mq"));
     classUnderTest.accept(context);
-    List<String> metricsList = new ArrayList<>(singletonList("ibm.mq.manager.status"));
-
+    long managerStatus = Long.MIN_VALUE;
+    long queueManagerUptime = Long.MIN_VALUE;
     for (MetricData metric : otelTesting.getMetrics()) {
-      if (metricsList.remove(metric.getName())) {
-        assertThat(metric.getLongGaugeData().getPoints().iterator().next().getValue()).isEqualTo(2);
+      if ("ibm.mq.manager.status".equals(metric.getName())) {
+        managerStatus = metric.getLongGaugeData().getPoints().iterator().next().getValue();
+      }
+      if ("ibm.mq.queue_manager.uptime".equals(metric.getName())) {
+        queueManagerUptime = metric.getLongSumData().getPoints().iterator().next().getValue();
       }
     }
-    assertThat(metricsList).isEmpty();
+    assertThat(managerStatus).isEqualTo(2);
+    assertThat(queueManagerUptime).isGreaterThan(0);
   }
 
   /*  Request
@@ -115,6 +116,8 @@ private static PCFMessage[] createPCFResponseForInquireQMgrStatusCmd() {
     response1.addParameter(CMQCFC.MQIACF_RESTART_LOG_SIZE, 42);
     response1.addParameter(CMQCFC.MQIACF_REUSABLE_LOG_SIZE, 42);
     response1.addParameter(CMQCFC.MQIACF_ARCHIVE_LOG_SIZE, 42);
+    response1.addParameter(CMQCFC.MQCACF_Q_MGR_START_DATE, "2024-01-01");
+    response1.addParameter(CMQCFC.MQCACF_Q_MGR_START_TIME, "12.00.00");
 
     return new PCFMessage[] {response1};
   }
diff --git a/ibm-mq-metrics/src/test/resources/conf/config.yml b/ibm-mq-metrics/src/test/resources/conf/config.yml
index 07b177098..cf9f5a7ea 100644
--- a/ibm-mq-metrics/src/test/resources/conf/config.yml
+++ b/ibm-mq-metrics/src/test/resources/conf/config.yml
@@ -178,6 +178,8 @@ metrics:
     enabled: true
   "ibm.mq.heartbeat":  # Queue manager heartbeat
     enabled: true
+  "ibm.mq.queue_manager.uptime":  # Queue manager uptime
+    enabled: true
   "ibm.mq.archive.log.size":  # Queue manager archive log size
     enabled: true
   "ibm.mq.manager.max.active.channels":  # Queue manager max active channels