diff --git a/apps/client/src/common/utils/__tests__/time.test.ts b/apps/client/src/common/utils/__tests__/time.test.ts
index beb195e5a..33edde1a6 100644
--- a/apps/client/src/common/utils/__tests__/time.test.ts
+++ b/apps/client/src/common/utils/__tests__/time.test.ts
@@ -1,3 +1,6 @@
+import { OffsetMode } from 'ontime-types';
+import { dayInMs } from 'ontime-utils';
+
 import { calculateTimeUntilStart, formatTime, nowInMillis } from '../time';
 
 describe('nowInMillis()', () => {
@@ -40,81 +43,251 @@ describe('formatTime()', () => {
 });
 
 describe('calculateTimeUntilStart()', () => {
-  test('ontime', () => {
+  describe('Absolute', () => {
+    test('ontime', () => {
+      const test = {
+        timeStart: 100,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 0,
+        clock: 90,
+        offset: 0,
+        offsetMode: OffsetMode.Absolute,
+      };
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(10);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(10);
+    });
+
+    test('running behind', () => {
+      const test = {
+        timeStart: 100,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 0,
+        clock: 90,
+        offset: -20,
+        offsetMode: OffsetMode.Absolute,
+      };
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(30);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(30);
+    });
+
+    test('running ahead', () => {
+      const test = {
+        timeStart: 100,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 0,
+        clock: 80,
+        offset: 10,
+        offsetMode: OffsetMode.Absolute,
+      };
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(20); // <-- when running ahead the unlinked timer stays put
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(10);
+    });
+
+    test('running behind with enough gaps', () => {
+      const test = {
+        timeStart: 100,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 20,
+        clock: 50,
+        offset: -20,
+        offsetMode: OffsetMode.Absolute,
+      };
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(50);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(70); // This should not be possible
+    });
+
+    test('running behind with to little gaps', () => {
+      const test = {
+        timeStart: 100,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 10,
+        clock: 50,
+        offset: -20,
+        offsetMode: OffsetMode.Absolute,
+      };
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(60);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(70); // This should not be possible
+    });
+  });
+
+  describe('Relative', () => {
+    test('Basic test', () => {
+      const test = {
+        timeStart: 0,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 0,
+        clock: 100,
+        actualStart: 100,
+        plannedStart: 0,
+        offset: 0, // relative
+        // offset: -100, // absolute
+        offsetMode: OffsetMode.Relative,
+      };
+
+      const timeStartEvent2 = 10;
+      const timeStartEvent3 = 20;
+
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent2, isLinkedToLoaded: true })).toBe(10);
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent3, isLinkedToLoaded: true })).toBe(20);
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent2, isLinkedToLoaded: false })).toBe(10);
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent3, isLinkedToLoaded: false })).toBe(20);
+
+      test.clock = 105;
+
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent2, isLinkedToLoaded: true })).toBe(5);
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent3, isLinkedToLoaded: true })).toBe(15);
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent2, isLinkedToLoaded: false })).toBe(5);
+      expect(calculateTimeUntilStart({ ...test, timeStart: timeStartEvent3, isLinkedToLoaded: false })).toBe(15);
+    });
+
+    test('Test gaps', () => {
+      const test = {
+        timeStart: 20,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 10,
+        clock: 100,
+        actualStart: 100,
+        plannedStart: 0,
+        offset: 0, // relative
+        // offset: -100, // absolute
+        offsetMode: OffsetMode.Relative,
+      };
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(20);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(20);
+
+      test.clock = 105;
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(15);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(15);
+    });
+
+    test('Test added/remove time', () => {
+      const test = {
+        timeStart: 20,
+        dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        totalGap: 0,
+        clock: 100,
+        actualStart: 100,
+        plannedStart: 0,
+        offset: 0, // relative
+        // offset: -100, // absolute
+        offsetMode: OffsetMode.Relative,
+      };
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(20);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(20);
+
+      test.offset = 5; // remove 5 with addtime - we are ahead of time
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(15);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(20); // unlocked evets will stay on schedule
+
+      test.offset = -5; // add 5 with addtime - we are behind
+
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(25);
+      expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(25);
+    });
+
+    test('Test next day', () => {
+      const test = {
+        // timeStart: 10,
+        // dayOffset: 0,
+        delay: 0,
+        currentDay: 0,
+        // totalGap: 0,
+        clock: 100,
+        actualStart: 100,
+        plannedStart: 0,
+        offset: 0, // relative
+        // offset: -100, // absolute
+        offsetMode: OffsetMode.Relative,
+      };
+
+      expect(
+        calculateTimeUntilStart({
+          ...test,
+          timeStart: 10,
+          dayOffset: 0,
+          totalGap: 0,
+          isLinkedToLoaded: true,
+        }),
+      ).toBe(10);
+      expect(
+        calculateTimeUntilStart({
+          ...test,
+          timeStart: 10,
+          dayOffset: 0,
+          totalGap: 0,
+          isLinkedToLoaded: false,
+        }),
+      ).toBe(10);
+
+      expect(
+        calculateTimeUntilStart({
+          ...test,
+          timeStart: 0,
+          dayOffset: 1,
+          totalGap: dayInMs - 20,
+          isLinkedToLoaded: false,
+        }),
+      ).toBe(dayInMs);
+
+      test.clock = 200;
+
+      expect(
+        calculateTimeUntilStart({
+          ...test,
+          timeStart: 0,
+          dayOffset: 1,
+          totalGap: dayInMs - 20,
+          isLinkedToLoaded: false,
+        }),
+      ).toBe(dayInMs - 100);
+    });
+  });
+
+  test('Test overlap', () => {
     const test = {
-      timeStart: 100,
+      // timeStart: 20,
       dayOffset: 0,
       delay: 0,
       currentDay: 0,
-      totalGap: 0,
-      clock: 90,
-      offset: 0,
+      // totalGap: 10,
+      clock: 100,
+      actualStart: 100,
+      plannedStart: 0,
+      offset: 0, // relative
+      // offset: -100, // absolute
+      offsetMode: OffsetMode.Relative,
+      isLinkedToLoaded: false,
     };
 
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(10);
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(10);
+    expect(calculateTimeUntilStart({ ...test, timeStart: 5, totalGap: -5 })).toBe(10);
+
+    test.clock = 105;
   });
-
-  test('running behind', () => {
-    const test = {
-      timeStart: 100,
-      dayOffset: 0,
-      delay: 0,
-      currentDay: 0,
-      totalGap: 0,
-      clock: 90,
-      offset: -20,
-    };
-
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(30);
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(30);
-  });
-
-  test('running ahead', () => {
-    const test = {
-      timeStart: 100,
-      dayOffset: 0,
-      delay: 0,
-      currentDay: 0,
-      totalGap: 0,
-      clock: 80,
-      offset: 10,
-    };
-
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(20); // <-- when running ahead the unlinked timer stays put
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(10);
-  });
-
-  test('running behind with enough gaps', () => {
-    const test = {
-      timeStart: 100,
-      dayOffset: 0,
-      delay: 0,
-      currentDay: 0,
-      totalGap: 20,
-      clock: 50,
-      offset: -20,
-    };
-
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(50);
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(70); // This should not be possible
-  });
-
-  test('running behind with to little gaps', () => {
-    const test = {
-      timeStart: 100,
-      dayOffset: 0,
-      delay: 0,
-      currentDay: 0,
-      totalGap: 10,
-      clock: 50,
-      offset: -20,
-    };
-
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: false })).toBe(60);
-    expect(calculateTimeUntilStart({ ...test, isLinkedToLoaded: true })).toBe(70); // This should not be possible
-  });
-
   //TODO: more indepth testing,
   // including day offset handling
   // and more?
diff --git a/apps/client/src/common/utils/time.ts b/apps/client/src/common/utils/time.ts
index 4c5ee9ed7..a5f5f99e5 100644
--- a/apps/client/src/common/utils/time.ts
+++ b/apps/client/src/common/utils/time.ts
@@ -1,4 +1,4 @@
-import { MaybeNumber, OntimeEvent, Settings, TimeFormat } from 'ontime-types';
+import { MaybeNumber, OffsetMode, OntimeEvent, Settings, TimeFormat } from 'ontime-types';
 import { dayInMs, formatFromMillis, MILLIS_PER_HOUR, MILLIS_PER_MINUTE, MILLIS_PER_SECOND } from 'ontime-utils';
 
 import { FORMAT_12, FORMAT_24 } from '../../viewerConfig';
@@ -138,6 +138,7 @@ export function useTimeUntilStart(
   data: Pick<OntimeEvent, 'timeStart' | 'dayOffset' | 'delay'> & {
     totalGap: number;
     isLinkedToLoaded: boolean;
+    offsetMode: OffsetMode;
   },
 ): number {
   const { offset, clock, currentDay } = useTimeUntilData();
@@ -160,9 +161,24 @@ export function calculateTimeUntilStart(
     isLinkedToLoaded: boolean;
     clock: number;
     offset: number;
+    offsetMode: OffsetMode;
+    actualStart?: number;
+    plannedStart?: number;
   },
 ): number {
-  const { timeStart, dayOffset, currentDay, totalGap, isLinkedToLoaded, clock, offset, delay } = data;
+  const {
+    timeStart,
+    dayOffset,
+    currentDay,
+    totalGap,
+    isLinkedToLoaded,
+    clock,
+    offset,
+    delay,
+    offsetMode,
+    actualStart,
+    plannedStart,
+  } = data;
 
   //How many days from the currently running event to this one
   const relativeDayOffset = dayOffset - currentDay;
@@ -172,20 +188,25 @@ export function calculateTimeUntilStart(
   //The normalised start time of this event relative to the currently running event
   const normalisedTimeStart = delayedStart + relativeDayOffset * dayInMs;
 
-  const offsetTimestart = normalisedTimeStart - offset;
-  const offsetTimeUntil = offsetTimestart - clock;
+  let relativeStartOffset = 0;
+
+  if (offsetMode === OffsetMode.Relative) {
+    assert(actualStart !== undefined);
+    assert(plannedStart !== undefined);
+    relativeStartOffset = actualStart - plannedStart;
+  }
+
+  const scheduledTimeUntil = normalisedTimeStart - clock + relativeStartOffset;
+
+  const offsetTimeUntil = scheduledTimeUntil - offset;
 
   if (isLinkedToLoaded) {
     //if we are directly linked back to the loaded event we just follow the offset
     return offsetTimeUntil;
   }
 
-  const scheduledTimeUntil = normalisedTimeStart - clock;
-
-  const isAheadOfSchedule = offset >= 0;
   const gapsCanCompensadeForOffset = totalGap + offset >= 0;
-
-  if (isAheadOfSchedule || gapsCanCompensadeForOffset) {
+  if (gapsCanCompensadeForOffset) {
     // if we are ahead of schedule or the gap can compensate for the amount we are behind then expect to start at the scheduled time
     return scheduledTimeUntil;
   }