diff --git a/apps/client/src/common/components/view-params-editor/common.options.ts b/apps/client/src/common/components/view-params-editor/common.options.ts
index 90af2968d..d3821fc6d 100644
--- a/apps/client/src/common/components/view-params-editor/common.options.ts
+++ b/apps/client/src/common/components/view-params-editor/common.options.ts
@@ -26,3 +26,14 @@ export const showLeadingZeros: ParamField = {
   type: 'boolean',
   defaultValue: false,
 };
+
+export type TimeOptions = {
+  timeformat: string | null;
+};
+
+/**
+ * Helper to get value of 'timeformat' from either source, prioritizing defaultValues
+ */
+export function getTimeOptionsFromParams(searchParams: URLSearchParams, defaultValues?: URLSearchParams) {
+  return defaultValues?.get('timeformat') ?? searchParams.get('timeformat');
+}
diff --git a/apps/client/src/common/utils/time.ts b/apps/client/src/common/utils/time.ts
index 0dce7c63a..9990092ce 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, MaybeString, OntimeEvent, Settings, TimeFormat } from 'ontime-types';
 import {
   MILLIS_PER_HOUR,
   MILLIS_PER_MINUTE,
@@ -75,8 +75,9 @@ function resolveTimeFormat(fallback12: string, fallback24: string): string {
 }
 
 type FormatOptions = {
-  format12: string;
-  format24: string;
+  format12?: string;
+  format24?: string;
+  override?: MaybeString;
 };
 
 /**
@@ -97,7 +98,7 @@ export const formatTime = (
     return '...';
   }
 
-  const timeFormat = resolver(options?.format12 ?? FORMAT_12, options?.format24 ?? FORMAT_24);
+  const timeFormat = options?.override ?? resolver(options?.format12 ?? FORMAT_12, options?.format24 ?? FORMAT_24);
   const display = formatFromMillis(Math.abs(milliseconds), timeFormat);
 
   const isNegative = milliseconds < 0;
diff --git a/apps/client/src/views/backstage/Backstage.tsx b/apps/client/src/views/backstage/Backstage.tsx
index ec87ebfcd..229ba5213 100644
--- a/apps/client/src/views/backstage/Backstage.tsx
+++ b/apps/client/src/views/backstage/Backstage.tsx
@@ -43,7 +43,7 @@ export default function BackstageLoader() {
 
 function Backstage({ events, customFields, projectData, isMirrored, settings }: BackstageData) {
   const { getLocalizedString } = useTranslation();
-  const { mainSource, secondarySource, extraInfo } = useBackstageOptions();
+  const { mainSource, secondarySource, extraInfo, timeformat } = useBackstageOptions();
   const { eventNext, eventNow, rundown, selectedEventId, time } = useBackstageSocket();
   const [blinkClass, setBlinkClass] = useState(false);
   const { height: screenHeight } = useViewportSize();
@@ -71,18 +71,20 @@ function Backstage({ events, customFields, projectData, isMirrored, settings }:
 
   // gather timer data
   const isPendingStart = getIsPendingStart(time.playback, time.phase);
-  const startedAt = isPendingStart ? formatTime(time.secondaryTimer) : formatTime(time.startedAt);
+  const startedAt = isPendingStart
+    ? formatTime(time.secondaryTimer, { override: timeformat })
+    : formatTime(time.startedAt, { override: timeformat });
 
   const scheduledStart = (() => {
     if (showNow) return undefined;
     if (!hasEvents) return undefined;
-    return formatTime(rundown.plannedStart, { format12: 'h:mm a', format24: 'HH:mm' });
+    return formatTime(rundown.plannedStart, { format12: 'h:mm a', format24: 'HH:mm', override: timeformat });
   })();
 
   const scheduledEnd = (() => {
     if (showNow) return undefined;
     if (!hasEvents) return undefined;
-    return formatTime(rundown.plannedEnd, { format12: 'h:mm a', format24: 'HH:mm' });
+    return formatTime(rundown.plannedEnd, { format12: 'h:mm a', format24: 'HH:mm', override: timeformat });
   })();
 
   let displayTimer = millisToString(time.current, { fallback: timerPlaceholderMin });
@@ -107,7 +109,7 @@ function Backstage({ events, customFields, projectData, isMirrored, settings }:
       <div className='project-header'>
         {projectData?.logo && <ViewLogo name={projectData.logo} className='logo' />}
         <div className='title'>{projectData.title}</div>
-        <BackstageClock />
+        <BackstageClock timeformat={timeformat} />
       </div>
 
       {showProgress && <ProgressBar className='progress-container' current={time.current} duration={time.duration} />}
@@ -131,7 +133,10 @@ function Backstage({ events, customFields, projectData, isMirrored, settings }:
                 {isOvertime(time.current) ? (
                   <div className='time-entry__value'>{getLocalizedString('countdown.overtime')}</div>
                 ) : (
-                  <SuperscriptTime time={formatTime(time.expectedFinish)} className='time-entry__value' />
+                  <SuperscriptTime
+                    time={formatTime(time.expectedFinish, { override: timeformat })}
+                    className='time-entry__value'
+                  />
                 )}
               </div>
               <div className='timer-gap' />
@@ -213,12 +218,12 @@ function ExtraInfo({ projectData, size, source }: ExtraInfoProps) {
   );
 }
 
-function BackstageClock() {
+function BackstageClock({ timeformat }: { timeformat: string | null }) {
   const { getLocalizedString } = useTranslation();
   const clock = useAutoTickingClock();
 
   // gather timer data
-  const formattedClock = formatTime(clock);
+  const formattedClock = formatTime(clock, { override: timeformat });
 
   return (
     <div className='clock-container'>
diff --git a/apps/client/src/views/backstage/backstage.options.ts b/apps/client/src/views/backstage/backstage.options.ts
index 2e7cf1ddd..9f67c2fa4 100644
--- a/apps/client/src/views/backstage/backstage.options.ts
+++ b/apps/client/src/views/backstage/backstage.options.ts
@@ -2,7 +2,11 @@ import { CustomFields, OntimeEvent, ProjectData } from 'ontime-types';
 import { use, useMemo } from 'react';
 import { useSearchParams } from 'react-router';
 
-import { getTimeOption } from '../../common/components/view-params-editor/common.options';
+import {
+  getTimeOption,
+  getTimeOptionsFromParams,
+  TimeOptions,
+} from '../../common/components/view-params-editor/common.options';
 import { OptionTitle } from '../../common/components/view-params-editor/constants';
 import { ViewOption } from '../../common/components/view-params-editor/viewParams.types';
 import {
@@ -71,7 +75,7 @@ type BackstageOptions = {
   mainSource: keyof OntimeEvent | null;
   secondarySource: keyof OntimeEvent | null;
   extraInfo: string | null;
-};
+} & TimeOptions;
 
 /**
  * Utility extract the view options from URL Params
@@ -85,6 +89,7 @@ function getOptionsFromParams(searchParams: URLSearchParams, defaultValues?: URL
     mainSource: getValue('main') as keyof OntimeEvent | null,
     secondarySource: getValue('secondary-src') as keyof OntimeEvent | null,
     extraInfo: getValue('extra-info'),
+    timeformat: getTimeOptionsFromParams(searchParams, defaultValues),
   };
 }
 
diff --git a/apps/client/src/views/common/viewUtils.ts b/apps/client/src/views/common/viewUtils.ts
index a1d9c43a7..e70ff21a1 100644
--- a/apps/client/src/views/common/viewUtils.ts
+++ b/apps/client/src/views/common/viewUtils.ts
@@ -101,6 +101,7 @@ export function getPropertyValue(
 type FormattingOptions = {
   removeSeconds: boolean;
   removeLeadingZero: boolean;
+  clockFormat?: MaybeString;
 };
 
 export function getFormattedTimer(
@@ -114,7 +115,7 @@ export function getFormattedTimer(
   }
 
   if (timerType === TimerType.Clock) {
-    return formatTime(timer);
+    return formatTime(timer, { override: options?.clockFormat });
   }
 
   let timeToParse = timer;
diff --git a/apps/client/src/views/countdown/Countdown.tsx b/apps/client/src/views/countdown/Countdown.tsx
index f657b3cbc..6c096b7d2 100644
--- a/apps/client/src/views/countdown/Countdown.tsx
+++ b/apps/client/src/views/countdown/Countdown.tsx
@@ -139,11 +139,12 @@ function CountdownContents({ playableEvents, subscriptions, goToEditMode }: Coun
 }
 
 function CountdownClock() {
+  const { timeformat } = useCountdownOptions();
   const { getLocalizedString } = useTranslation();
   const clock = useAutoTickingClock();
 
   // gather timer data
-  const formattedClock = formatTime(clock);
+  const formattedClock = formatTime(clock, { override: timeformat });
 
   return (
     <div className='clock-container'>
diff --git a/apps/client/src/views/countdown/countdown.options.ts b/apps/client/src/views/countdown/countdown.options.ts
index 7f0e12cc7..788a3bd48 100644
--- a/apps/client/src/views/countdown/countdown.options.ts
+++ b/apps/client/src/views/countdown/countdown.options.ts
@@ -2,7 +2,11 @@ import { CustomFields, EntryId, OntimeEvent } from 'ontime-types';
 import { use, useMemo } from 'react';
 import { useSearchParams } from 'react-router';
 
-import { getTimeOption } from '../../common/components/view-params-editor/common.options';
+import {
+  getTimeOption,
+  getTimeOptionsFromParams,
+  TimeOptions,
+} from '../../common/components/view-params-editor/common.options';
 import { OptionTitle } from '../../common/components/view-params-editor/constants';
 import { ViewOption } from '../../common/components/view-params-editor/viewParams.types';
 import { makeOptionsFromCustomFields } from '../../common/components/view-params-editor/viewParams.utils';
@@ -91,7 +95,7 @@ type CountdownOptions = {
   secondarySource: keyof OntimeEvent | null;
   showExpected: boolean;
   hidePast: boolean;
-};
+} & TimeOptions;
 
 /**
  * Utility extract the view options from URL Params
@@ -115,6 +119,7 @@ function getOptionsFromParams(searchParams: URLSearchParams, defaultValues?: URL
     secondarySource: getValue('secondary-src') as keyof OntimeEvent | null,
     showExpected: isStringBoolean(getValue('showExpected')),
     hidePast: isStringBoolean(getValue('hidePast')),
+    timeformat: getTimeOptionsFromParams(searchParams, defaultValues),
   };
 }
 
diff --git a/apps/client/src/views/studio/StudioClock.tsx b/apps/client/src/views/studio/StudioClock.tsx
index f764aee45..585a6a8fc 100644
--- a/apps/client/src/views/studio/StudioClock.tsx
+++ b/apps/client/src/views/studio/StudioClock.tsx
@@ -6,6 +6,7 @@ import { useStudioClockSocket } from '../../common/hooks/useSocket';
 import { cx } from '../../common/utils/styleUtils';
 import { formatTime } from '../../common/utils/time';
 import SuperscriptTime from '../common/superscript-time/SuperscriptTime';
+import { useStudioOptions } from './studio.options';
 import { getLargeClockData } from './studioClock.utils';
 
 import './StudioClock.scss';
@@ -18,6 +19,7 @@ interface StudioClockProps {
 }
 
 export default function StudioClock({ hideCards }: StudioClockProps) {
+  const { timeformat } = useStudioOptions();
   const isSmallScreen = useIsSmallScreen();
   const clock = useAutoTickingClock();
   const { playback } = useStudioClockSocket();
@@ -25,10 +27,10 @@ export default function StudioClock({ hideCards }: StudioClockProps) {
 
   // if we are on mobile and have to show the cards
   if (isSmallScreen && !hideCards) {
-    return <StudioClockMobile clock={clock} onAir={onAir} />;
+    return <StudioClockMobile clock={clock} onAir={onAir} timeformat={timeformat} />;
   }
 
-  const { seconds, display, meridian } = getLargeClockData(clock);
+  const { seconds, display, meridian } = getLargeClockData(clock, timeformat);
 
   return (
     <div className='studio__clock'>
@@ -62,10 +64,11 @@ export default function StudioClock({ hideCards }: StudioClockProps) {
 interface StudioClockMobileProps {
   clock: number;
   onAir: boolean;
+  timeformat: string | null;
 }
 
-function StudioClockMobile({ clock, onAir }: StudioClockMobileProps) {
-  const displayClock = formatTime(clock);
+function StudioClockMobile({ clock, onAir, timeformat }: StudioClockMobileProps) {
+  const displayClock = formatTime(clock, { override: timeformat });
 
   return (
     <div className='studio__clock studio__clock--small'>
diff --git a/apps/client/src/views/studio/studio.options.ts b/apps/client/src/views/studio/studio.options.ts
index f13075d92..16f4551c8 100644
--- a/apps/client/src/views/studio/studio.options.ts
+++ b/apps/client/src/views/studio/studio.options.ts
@@ -2,7 +2,11 @@ import { CustomFields, OntimeEvent } from 'ontime-types';
 import { use, useMemo } from 'react';
 import { useSearchParams } from 'react-router';
 
-import { getTimeOption } from '../../common/components/view-params-editor/common.options';
+import {
+  getTimeOption,
+  getTimeOptionsFromParams,
+  TimeOptions,
+} from '../../common/components/view-params-editor/common.options';
 import { OptionTitle } from '../../common/components/view-params-editor/constants';
 import { ViewOption } from '../../common/components/view-params-editor/viewParams.types';
 import { makeOptionsFromCustomFields } from '../../common/components/view-params-editor/viewParams.utils';
@@ -47,7 +51,7 @@ export const getStudioOptions = (timeFormat: string, customFields: CustomFields)
 type StudioOptions = {
   mainSource: keyof OntimeEvent | null;
   hideCards: boolean;
-};
+} & TimeOptions;
 
 /**
  * Utility extract the view options from URL Params
@@ -60,6 +64,7 @@ function getOptionsFromParams(searchParams: URLSearchParams, defaultValues?: URL
   return {
     mainSource: getValue('main') as keyof OntimeEvent | null,
     hideCards: isStringBoolean(getValue('hideCards')),
+    timeformat: getTimeOptionsFromParams(searchParams, defaultValues),
   };
 }
 
diff --git a/apps/client/src/views/studio/studioClock.utils.ts b/apps/client/src/views/studio/studioClock.utils.ts
index 6dcd0812c..4bee0bfa1 100644
--- a/apps/client/src/views/studio/studioClock.utils.ts
+++ b/apps/client/src/views/studio/studioClock.utils.ts
@@ -5,9 +5,9 @@ import { formatTime } from '../../common/utils/time';
 /**
  * Gathers display elements for the large studio clock
  */
-export function getLargeClockData(clock: number) {
+export function getLargeClockData(clock: number, timeformat: string | null) {
   const [display, meridian] = (() => {
-    const formatted = formatTime(clock);
+    const formatted = formatTime(clock, { override: timeformat });
     if (formatted.endsWith('AM')) {
       return [formatted.slice(0, -2), 'AM'];
     }
diff --git a/apps/client/src/views/timeline/TimelinePage.tsx b/apps/client/src/views/timeline/TimelinePage.tsx
index 8882ec81a..c6d0cdb49 100644
--- a/apps/client/src/views/timeline/TimelinePage.tsx
+++ b/apps/client/src/views/timeline/TimelinePage.tsx
@@ -37,7 +37,7 @@ export default function TimelinePageLoader() {
 
 function TimelinePage({ events, customFields, projectData, settings }: TimelineData) {
   const selectedEventId = useSelectedEventId();
-  const { mainSource } = useTimelineOptions();
+  const { mainSource, timeformat } = useTimelineOptions();
   // holds copy of the rundown with only relevant events
   const { scopedRundown, firstStart, totalDuration } = useScopedRundown(events, selectedEventId);
 
@@ -56,7 +56,7 @@ function TimelinePage({ events, customFields, projectData, settings }: TimelineD
       <div className='project-header'>
         {projectData?.logo && <ViewLogo name={projectData.logo} className='logo' />}
         <div className='title'>{projectData.title}</div>
-        <TimelineClock />
+        <TimelineClock timeformat={timeformat} />
       </div>
 
       <TimelineSections now={now} next={next} followedBy={followedBy} mainSource={mainSource} />
@@ -71,12 +71,12 @@ function TimelinePage({ events, customFields, projectData, settings }: TimelineD
   );
 }
 
-function TimelineClock() {
+function TimelineClock({ timeformat }: { timeformat: string | null }) {
   const { getLocalizedString } = useTranslation();
   const clock = useAutoTickingClock();
 
   // gather timer data
-  const formattedClock = formatTime(clock);
+  const formattedClock = formatTime(clock, { override: timeformat });
 
   return (
     <div className='clock-container'>
diff --git a/apps/client/src/views/timeline/timeline.options.ts b/apps/client/src/views/timeline/timeline.options.ts
index 23c5cbfa3..a322937dc 100644
--- a/apps/client/src/views/timeline/timeline.options.ts
+++ b/apps/client/src/views/timeline/timeline.options.ts
@@ -2,7 +2,11 @@ import { CustomFields, OntimeEvent } from 'ontime-types';
 import { use, useMemo } from 'react';
 import { useSearchParams } from 'react-router';
 
-import { getTimeOption } from '../../common/components/view-params-editor/common.options';
+import {
+  getTimeOption,
+  getTimeOptionsFromParams,
+  TimeOptions,
+} from '../../common/components/view-params-editor/common.options';
 import { OptionTitle } from '../../common/components/view-params-editor/constants';
 import { ViewOption } from '../../common/components/view-params-editor/viewParams.types';
 import { makeOptionsFromCustomFields } from '../../common/components/view-params-editor/viewParams.utils';
@@ -55,7 +59,7 @@ type TimelineOptions = {
   mainSource: keyof OntimeEvent | null;
   hidePast: boolean;
   fixedSize: boolean;
-};
+} & TimeOptions;
 
 /**
  * Utility extract the view options from URL Params
@@ -69,6 +73,7 @@ function getOptionsFromParams(searchParams: URLSearchParams, defaultValues?: URL
     mainSource: getValue('main') as keyof OntimeEvent | null,
     hidePast: isStringBoolean(getValue('hidePast')),
     fixedSize: isStringBoolean(getValue('fixedSize')),
+    timeformat: getTimeOptionsFromParams(searchParams, defaultValues),
   };
 }
 
diff --git a/apps/client/src/views/timer/Timer.tsx b/apps/client/src/views/timer/Timer.tsx
index 4605b3d3a..3ae139d26 100644
--- a/apps/client/src/views/timer/Timer.tsx
+++ b/apps/client/src/views/timer/Timer.tsx
@@ -1,4 +1,4 @@
-import { OntimeView, TimerType } from 'ontime-types';
+import { MaybeString, OntimeView, TimerType } from 'ontime-types';
 import { useMemo } from 'react';
 
 import { FitText } from '../../common/components/fit-text/FitText';
@@ -69,6 +69,7 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
     font,
     keyColour,
     timerColour,
+    timeformat,
   } = useTimerOptions();
 
   const { getLocalizedString } = useTranslation();
@@ -106,6 +107,7 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
   const display = getFormattedTimer(stageTimer, viewTimerType, localisedMinutes, {
     removeSeconds: hideTimerSeconds,
     removeLeadingZero: removeLeadingZeros,
+    clockFormat: timeformat,
   });
 
   const currentAux = (() => {
@@ -164,7 +166,7 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
         </div>
       )}
 
-      {showClock && <TimerAutoTickingClock />}
+      {showClock && <TimerAutoTickingClock clockFormat={timeformat} />}
 
       <div className={cx(['timer-container', message.timer.blink && !showOverlay && 'blink'])}>
         {showEndMessage ? (
@@ -212,9 +214,9 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
   );
 }
 
-function TimerAutoTickingClock() {
+function TimerAutoTickingClock({ clockFormat }: { clockFormat: MaybeString }) {
   const autoTickingClock = useAutoTickingClock();
-  const formattedClock = formatTime(autoTickingClock);
+  const formattedClock = formatTime(autoTickingClock, { override: clockFormat });
   const { getLocalizedString } = useTranslation();
 
   return (
diff --git a/apps/client/src/views/timer/timer.options.ts b/apps/client/src/views/timer/timer.options.ts
index 9533d8852..c6bde0f29 100644
--- a/apps/client/src/views/timer/timer.options.ts
+++ b/apps/client/src/views/timer/timer.options.ts
@@ -6,8 +6,10 @@ import { useSearchParams } from 'react-router';
 import type { SelectOption } from '../../common/components/select/Select';
 import {
   getTimeOption,
+  getTimeOptionsFromParams,
   hideTimerSeconds,
   showLeadingZeros,
+  TimeOptions,
 } from '../../common/components/view-params-editor/common.options';
 import { OptionTitle } from '../../common/components/view-params-editor/constants';
 import { ViewOption } from '../../common/components/view-params-editor/viewParams.types';
@@ -194,7 +196,7 @@ type TimerOptions = {
   font?: string;
   keyColour?: string;
   timerColour?: string;
-};
+} & TimeOptions;
 
 /**
  * Utility extract the view options from URL Params
@@ -229,6 +231,7 @@ function getOptionsFromParams(searchParams: URLSearchParams, defaultValues?: URL
     font: getValue('font') ?? undefined,
     keyColour: makeColourString(getValue('keyColour')),
     timerColour: makeColourString(getValue('timerColour')),
+    timeformat: getTimeOptionsFromParams(searchParams, defaultValues),
   };
 }