diff --git a/CHANGES b/CHANGES
index 891e2ca6f..aed3e0c11 100644
--- a/CHANGES
+++ b/CHANGES
@@ -64,6 +64,7 @@ Other fixes:
  - VFS: Failed file mapping should return NULL on POSIX
 Misc:
  - Core: Suspend runloop when a core crashes
+ - Core: Add wallclock offset RTC type
  - Debugger: Save and restore CLI history
  - Debugger: GDB now works while the game is paused
  - Debugger: Add command to load external symbol file (fixes mgba.io/i/2480)
diff --git a/include/mgba/core/interface.h b/include/mgba/core/interface.h
index fadaaa29d..e2625045f 100644
--- a/include/mgba/core/interface.h
+++ b/include/mgba/core/interface.h
@@ -239,6 +239,7 @@ enum mRTCGenericType {
 	RTC_NO_OVERRIDE,
 	RTC_FIXED,
 	RTC_FAKE_EPOCH,
+	RTC_WALLCLOCK_OFFSET,
 	RTC_CUSTOM_START = 0x1000
 };
 
diff --git a/src/core/interface.c b/src/core/interface.c
index 961b83619..d63754895 100644
--- a/src/core/interface.c
+++ b/src/core/interface.c
@@ -21,6 +21,7 @@ static void _rtcGenericSample(struct mRTCSource* source) {
 	case RTC_NO_OVERRIDE:
 	case RTC_FIXED:
 	case RTC_FAKE_EPOCH:
+	case RTC_WALLCLOCK_OFFSET:
 		break;
 	}
 }
@@ -39,6 +40,8 @@ static time_t _rtcGenericCallback(struct mRTCSource* source) {
 		return rtc->value / 1000LL;
 	case RTC_FAKE_EPOCH:
 		return (rtc->value + rtc->p->frameCounter(rtc->p) * (rtc->p->frameCycles(rtc->p) * 1000LL) / rtc->p->frequency(rtc->p)) / 1000LL;
+	case RTC_WALLCLOCK_OFFSET:
+		return time(0) + rtc->value / 1000LL;
 	}
 }
 
diff --git a/src/platform/qt/CoreController.cpp b/src/platform/qt/CoreController.cpp
index ec0edea11..8814f4443 100644
--- a/src/platform/qt/CoreController.cpp
+++ b/src/platform/qt/CoreController.cpp
@@ -898,6 +898,11 @@ void CoreController::setFakeEpoch(const QDateTime& time) {
 	m_threadContext.core->rtc.value = time.toMSecsSinceEpoch();
 }
 
+void CoreController::setTimeOffset(qint64 offset) {
+	m_threadContext.core->rtc.override = RTC_WALLCLOCK_OFFSET;
+	m_threadContext.core->rtc.value = offset * 1000LL;
+}
+
 void CoreController::scanCard(const QString& path) {
 #ifdef M_CORE_GBA
 	QImage image(path);
diff --git a/src/platform/qt/CoreController.h b/src/platform/qt/CoreController.h
index 663d0ed96..3e5ca6b4d 100644
--- a/src/platform/qt/CoreController.h
+++ b/src/platform/qt/CoreController.h
@@ -174,6 +174,7 @@ public slots:
 	void setRealTime();
 	void setFixedTime(const QDateTime& time);
 	void setFakeEpoch(const QDateTime& time);
+	void setTimeOffset(qint64 offset);
 
 	void importSharkport(const QString& path);
 	void exportSharkport(const QString& path);
diff --git a/src/platform/qt/SensorView.cpp b/src/platform/qt/SensorView.cpp
index 1742a26ee..22c2f5f3f 100644
--- a/src/platform/qt/SensorView.cpp
+++ b/src/platform/qt/SensorView.cpp
@@ -69,6 +69,14 @@ void SensorView::setController(std::shared_ptr<CoreController> controller) {
 	connect(m_ui.timeFakeEpoch, &QRadioButton::clicked, [controller, this] () {
 		controller->setFakeEpoch(m_ui.time->dateTime().toUTC());
 	});
+	connect(m_ui.timeOffset, &QRadioButton::clicked, [controller, this] () {
+		controller->setTimeOffset(m_ui.offsetSeconds->value());
+	});
+	connect(m_ui.offsetSeconds, qOverload<int>(&QSpinBox::valueChanged), [controller, this] (int value) {
+		if (m_ui.timeOffset->isChecked()) {
+			controller->setTimeOffset(value);
+		}
+	});
 	m_ui.timeButtons->checkedButton()->clicked();
 
 	connect(controller.get(), &CoreController::stopping, [this]() {
diff --git a/src/platform/qt/SensorView.ui b/src/platform/qt/SensorView.ui
index 7d65ba52c..ac7032e4d 100644
--- a/src/platform/qt/SensorView.ui
+++ b/src/platform/qt/SensorView.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>434</width>
-    <height>319</height>
+    <width>448</width>
+    <height>332</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -19,28 +19,18 @@
   <property name="windowTitle">
    <string>Sensors</string>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
+  <layout class="QHBoxLayout" name="horizontalLayout">
    <property name="sizeConstraint">
     <enum>QLayout::SetFixedSize</enum>
    </property>
    <item>
-    <layout class="QHBoxLayout" name="horizontalLayout">
+    <layout class="QVBoxLayout" name="verticalLayout_2">
      <item>
       <widget class="QGroupBox" name="groupBox">
        <property name="title">
         <string>Realtime clock</string>
        </property>
        <layout class="QGridLayout" name="gridLayout_4">
-        <item row="1" column="0">
-         <widget class="QRadioButton" name="timeFixed">
-          <property name="text">
-           <string>Fixed time</string>
-          </property>
-          <attribute name="buttonGroup">
-           <string notr="true">timeButtons</string>
-          </attribute>
-         </widget>
-        </item>
         <item row="0" column="0">
          <widget class="QRadioButton" name="timeNoOverride">
           <property name="text">
@@ -54,7 +44,53 @@
           </attribute>
          </widget>
         </item>
+        <item row="1" column="0">
+         <widget class="QRadioButton" name="timeFixed">
+          <property name="text">
+           <string>Fixed time</string>
+          </property>
+          <attribute name="buttonGroup">
+           <string notr="true">timeButtons</string>
+          </attribute>
+         </widget>
+        </item>
+        <item row="1" column="1">
+         <widget class="QPushButton" name="timeNow">
+          <property name="text">
+           <string>Now</string>
+          </property>
+         </widget>
+        </item>
         <item row="2" column="0">
+         <widget class="QRadioButton" name="timeOffset">
+          <property name="text">
+           <string>Offset time</string>
+          </property>
+          <attribute name="buttonGroup">
+           <string notr="true">timeButtons</string>
+          </attribute>
+         </widget>
+        </item>
+        <item row="2" column="1">
+         <widget class="QSpinBox" name="offsetSeconds">
+          <property name="suffix">
+           <string> sec</string>
+          </property>
+          <property name="minimum">
+           <number>-99999999</number>
+          </property>
+          <property name="maximum">
+           <number>99999999</number>
+          </property>
+          <property name="singleStep">
+           <number>1</number>
+          </property>
+          <property name="stepType">
+           <enum>QAbstractSpinBox::AdaptiveDecimalStepType</enum>
+          </property>
+         </widget>
+        </item>
+        <item row="3" column="0">
          <widget class="QRadioButton" name="timeFakeEpoch">
           <property name="text">
            <string>Start time at</string>
@@ -64,14 +100,7 @@
           </attribute>
          </widget>
         </item>
-        <item row="0" column="1" rowspan="3">
-         <widget class="QPushButton" name="timeNow">
-          <property name="text">
-           <string>Now</string>
-          </property>
-         </widget>
-        </item>
-        <item row="3" column="0" colspan="2">
+        <item row="4" column="0" colspan="2">
          <widget class="QDateTimeEdit" name="time">
           <property name="wrapping">
            <bool>true</bool>
@@ -143,7 +172,7 @@
     </layout>
    </item>
    <item>
-    <layout class="QHBoxLayout" name="horizontalLayout_2">
+    <layout class="QVBoxLayout" name="verticalLayout_3">
      <item>
       <widget class="QGroupBox" name="tilt">
        <property name="title">