merge: 최신 main을 Gateway 릴리스 시각 교정에 통합

app/game-api/src/router/general/index.ts

@@ -45,6 +45,7 @@ import {
 import {
     resolveGeneralTypeCall,
     resolveLeadershipBonus,
+    resolveNextTurnMonthOffset,
     resolveRefreshScoreText,
     resolveRemainingMinutes,
 } from '../../services/generalBasicCardProjection.js';
@@ -265,6 +266,7 @@ export const getGeneralContext = async (ctx: GameApiContext) => {
             dedication: true,
             age: true,
             turnTime: true,
+            turnTick: true,
             recentWarTime: true,
             crewTypeId: true,
             personalCode: true,
@@ -333,7 +335,14 @@ export const getGeneralContext = async (ctx: GameApiContext) => {
                   })
                 : Promise.resolve(NEUTRAL_NATION_CONTEXT),
             ctx.db.worldState.findFirst({
-                select: { currentYear: true, currentMonth: true, tickSeconds: true, config: true, meta: true },
+                select: {
+                    currentYear: true,
+                    currentMonth: true,
+                    tickSeconds: true,
+                    lastTurnTick: true,
+                    config: true,
+                    meta: true,
+                },
             }),
             officerCityId > 0
                 ? ctx.db.city.findUnique({ where: { id: officerCityId }, select: { name: true } })
@@ -521,6 +530,13 @@ export const getGeneralContext = async (ctx: GameApiContext) => {
             age: general.age,
             retirementYear,
             turnTime: general.turnTime.toISOString(),
+            nextTurnMonthOffset: resolveNextTurnMonthOffset({
+                turnTime: general.turnTime,
+                turnTick: general.turnTick,
+                lastExecuted: parsedLastExecuted,
+                lastTurnTick: worldState?.lastTurnTick,
+                turnSeconds: worldState?.tickSeconds ?? 0,
+            }),
             recentWar: general.recentWarTime?.toISOString() ?? null,
             defenceTrain: settings.defence_train,
             killTurn: readNumber(metaRecord.killturn ?? metaRecord.killTurn, 0),

app/game-api/src/services/generalBasicCardProjection.ts

@@ -1,3 +1,5 @@
+import { GAME_TICKS_PER_TURN } from '@sammo-ts/common';
+
 export interface GeneralBasicStats {
     leadership: number;
     strength: number;
@@ -53,3 +55,41 @@ export const resolveRemainingMinutes = (
     }
     return Math.floor(Math.min(999, Math.max(0, (nextTurnMillis - lastExecuted.getTime()) / 60_000)));
 };
+
+export interface NextTurnMonthOffsetInput {
+    turnTime: Date;
+    turnTick?: bigint | number | null;
+    lastExecuted: Date | null;
+    lastTurnTick?: bigint | number | null;
+    turnSeconds: number;
+}
+
+const normalizeTick = (value: bigint | number | null | undefined): bigint | null => {
+    if (typeof value === 'bigint') return value;
+    if (typeof value === 'number' && Number.isSafeInteger(value)) return BigInt(value);
+    return null;
+};
+
+const turnBucket = (tick: bigint): bigint => {
+    const ticksPerTurn = BigInt(GAME_TICKS_PER_TURN);
+    const quotient = tick / ticksPerTurn;
+    return tick % ticksPerTurn < 0 ? quotient - 1n : quotient;
+};
+
+/**
+ * Ref Command.GetReservedCommand cuts both clocks to a gameplay-turn bucket.
+ * A general in the next bucket has already acted in the displayed world month,
+ * so the first reserved command belongs to the following month.
+ */
+export const resolveNextTurnMonthOffset = (input: NextTurnMonthOffsetInput): 0 | 1 => {
+    const turnTick = normalizeTick(input.turnTick);
+    const lastTurnTick = normalizeTick(input.lastTurnTick);
+    if (turnTick !== null && lastTurnTick !== null) {
+        return turnBucket(turnTick) > turnBucket(lastTurnTick) ? 1 : 0;
+    }
+
+    const turnTimeMs = input.turnTime.getTime();
+    const lastExecutedMs = input.lastExecuted?.getTime() ?? Number.NaN;
+    if (!Number.isFinite(turnTimeMs) || !Number.isFinite(lastExecutedMs) || input.turnSeconds <= 0) return 0;
+    return turnTimeMs >= lastExecutedMs + input.turnSeconds * 1_000 ? 1 : 0;
+};

app/game-api/test/generalBasicCardProjection.test.ts

@@ -3,6 +3,7 @@ import { describe, expect, it } from 'vitest';
 import {
     resolveGeneralTypeCall,
     resolveLeadershipBonus,
+    resolveNextTurnMonthOffset,
     resolveRefreshScoreText,
     resolveRemainingMinutes,
 } from '../src/services/generalBasicCardProjection.js';
@@ -41,4 +42,55 @@ describe('general basic card Ref projection', () => {
         expect(resolveRemainingMinutes(new Date('2026-08-12T23:59:00.000Z'), lastExecuted, 3_600)).toBe(59);
         expect(resolveRemainingMinutes(new Date('2026-08-13T00:07:06.000Z'), null, 3_600)).toBeNull();
     });
+
+    it('moves the first reserved month only after the general turn bucket has passed', () => {
+        const lastExecuted = new Date('2026-08-13T00:00:00.000Z');
+        const lastTurnTick = 36_000_000n * 11n;
+
+        expect(
+            resolveNextTurnMonthOffset({
+                turnTime: new Date('2026-08-13T00:07:00.000Z'),
+                turnTick: lastTurnTick + 12_000_000n,
+                lastExecuted,
+                lastTurnTick,
+                turnSeconds: 600,
+            })
+        ).toBe(0);
+        expect(
+            resolveNextTurnMonthOffset({
+                turnTime: new Date('2026-08-13T00:17:00.000Z'),
+                turnTick: lastTurnTick + 48_000_000n,
+                lastExecuted,
+                lastTurnTick,
+                turnSeconds: 600,
+            })
+        ).toBe(1);
+        expect(
+            resolveNextTurnMonthOffset({
+                turnTime: new Date('2026-08-13T00:10:00.000Z'),
+                turnTick: 1n,
+                lastExecuted,
+                lastTurnTick: -1n,
+                turnSeconds: 600,
+            })
+        ).toBe(1);
+    });
+
+    it('keeps the same boundary for legacy Date-only schedules', () => {
+        const lastExecuted = new Date('2026-08-13T00:00:00.000Z');
+        expect(
+            resolveNextTurnMonthOffset({
+                turnTime: new Date('2026-08-13T00:07:00.000Z'),
+                lastExecuted,
+                turnSeconds: 600,
+            })
+        ).toBe(0);
+        expect(
+            resolveNextTurnMonthOffset({
+                turnTime: new Date('2026-08-13T00:10:00.000Z'),
+                lastExecuted,
+                turnSeconds: 600,
+            })
+        ).toBe(1);
+    });
 });

app/game-frontend/e2e/mainNavigation.spec.ts

@@ -34,6 +34,7 @@ type NavigationFixture = {
     operations: string[];
     generalName?: string;
     generalTurnTime?: string;
+    nextTurnMonthOffset?: 0 | 1;
     serverTime?: string;
     serverWallTime?: string;
     clockMode?: 'realtime' | 'manual';
@@ -440,6 +441,7 @@ const generalContext = (state: NavigationFixture) => ({
         crewTypeName: '보병',
         traits: { personal: '대담', specialDomestic: '상재', specialWar: '무쌍' },
         turnTime: state.generalTurnTime ?? '0185-01-01T00:00:00.000Z',
+        nextTurnMonthOffset: state.nextTurnMonthOffset ?? 0,
     },
     city: {
         id: 1,
@@ -1188,7 +1190,7 @@ test('desktop menus preserve ref columns, prefix-safe routes, and controlled dro
     await expect(page.locator('.legacy-game-info')).toContainText('현재: 185년 1월');
     await expect(page.locator('.legacy-game-info')).toContainText('턴: 10분');
     await expect(page.locator('.legacy-game-info')).not.toContainText('최근 턴:');
-    await expect(page.locator('.execution-status')).toHaveText('동작 시각: 08-13 09:05');
+    await expect(page.locator('.execution-status')).toHaveText('현재 시각: 08-13 09:00');
     await expect(page.locator('.tournament-status')).toHaveText('토너먼트: 참가 모집중');
     await expect(page.locator('.vote-status')).toHaveText('설문: 메뉴 설문');
     const headerStatusGeometry = await page.locator('.main-page').evaluate((element) => {
@@ -1623,6 +1625,105 @@ test('the repeated bottom global menu opens upward on the mobile document', asyn
     await persistArtifact(page, `${basePath.slice(1)}-mobile-bottom-dropup`);
 });
 
+test('first reserved month crosses December only after the general turn has passed', async ({ page }, testInfo) => {
+    const state: NavigationFixture = {
+        officerLevel: 0,
+        permission: 0,
+        nationLevel: 0,
+        stage: 0,
+        npcMode: 1,
+        generalMeCalls: 0,
+        operations: [],
+        currentYear: 179,
+        currentMonth: 12,
+        nextTurnMonthOffset: 0,
+        validMapImages: true,
+        reservedTurns: [
+            { index: 0, action: '휴식', args: {} },
+            { index: 1, action: '휴식', args: {} },
+        ],
+    };
+    await installRealtimeHarness(page);
+    await installFixture(page, state);
+    await page.setViewportSize({ width: 1200, height: 900 });
+    await waitForMain(page);
+    await waitForMainRealtime(page);
+
+    const map = page.locator('[data-main-target="map"] .map-viewer').first();
+    const commandPanel = page.locator('[data-main-target="commands"]').first();
+    const firstDate = commandPanel.locator('.date-column [data-turn-index="0"]');
+    const secondDate = commandPanel.locator('.date-column [data-turn-index="1"]');
+
+    await expect(map).toContainText('179年 12月');
+    await expect(firstDate).toHaveText('179年 12月');
+    await expect(secondDate).toHaveText('180年 1月');
+    const before = await firstDate.evaluate((element) => {
+        const rect = element.getBoundingClientRect();
+        const style = getComputedStyle(element);
+        return {
+            rect: rect.toJSON(),
+            fontSize: style.fontSize,
+            lineHeight: style.lineHeight,
+            color: style.color,
+            documentScrollWidth: document.documentElement.scrollWidth,
+            viewportWidth: window.innerWidth,
+        };
+    });
+    await commandPanel.screenshot({ path: testInfo.outputPath('turn-month-before.png') });
+
+    state.nextTurnMonthOffset = 1;
+    state.contextRevision = 'BBBBBBBBBBBBBBBBBBBBBB';
+    state.contextOperations = [{ op: 'replace', path: '/general/nextTurnMonthOffset', value: 1 }];
+    await emitReadModelInvalidation(page, readModelInvalidation({ context: true }));
+
+    await expect(map).toContainText('179年 12月');
+    await expect(firstDate).toHaveText('180年 1月');
+    await expect(secondDate).toHaveText('180年 2月');
+    await firstDate.hover();
+    const after = await firstDate.evaluate((element) => {
+        const rect = element.getBoundingClientRect();
+        const style = getComputedStyle(element);
+        return {
+            rect: rect.toJSON(),
+            fontSize: style.fontSize,
+            lineHeight: style.lineHeight,
+            color: style.color,
+            documentScrollWidth: document.documentElement.scrollWidth,
+            viewportWidth: window.innerWidth,
+        };
+    });
+    expect(after.rect.width).toBe(before.rect.width);
+    expect(after.rect.height).toBe(before.rect.height);
+    expect(after.rect.left).toBe(before.rect.left);
+    expect(after.rect.right).toBe(before.rect.right);
+    expect(after.fontSize).toBe(before.fontSize);
+    expect(after.lineHeight).toBe(before.lineHeight);
+    expect(after.color).toBe(before.color);
+    expect(before.documentScrollWidth).toBe(before.viewportWidth);
+    expect(after.documentScrollWidth).toBe(after.viewportWidth);
+    await commandPanel.screenshot({ path: testInfo.outputPath('turn-month-after.png') });
+
+    await page.setViewportSize({ width: 390, height: 844 });
+    await firstDate.scrollIntoViewIfNeeded();
+    await expect(firstDate).toHaveText('180年 1月');
+    const mobile = await firstDate.evaluate((element) => {
+        const rect = element.getBoundingClientRect();
+        const style = getComputedStyle(element);
+        return {
+            rect: rect.toJSON(),
+            fontSize: style.fontSize,
+            lineHeight: style.lineHeight,
+            documentScrollWidth: document.documentElement.scrollWidth,
+        };
+    });
+    expect(mobile.rect.left).toBeGreaterThanOrEqual(0);
+    expect(mobile.rect.right).toBeLessThanOrEqual(500);
+    expect(mobile.fontSize).toBe(before.fontSize);
+    expect(mobile.lineHeight).toBe(before.lineHeight);
+    expect(mobile.documentScrollWidth).toBe(500);
+    await commandPanel.screenshot({ path: testInfo.outputPath('turn-month-mobile.png') });
+});
+
 test('main general card uses local turn time and command clock tracks corrected server time', async ({ page }) => {
     const state: NavigationFixture = {
         officerLevel: 0,
@@ -1793,6 +1894,89 @@ test('main general card uses local turn time and command clock tracks corrected
     expect(state.operations).toHaveLength(operationsBeforePreopenBoundary);
 });
 
+test('main header clock follows minute boundaries only while game-server contact is recent', async ({
+    page,
+}, testInfo) => {
+    const state: NavigationFixture = {
+        officerLevel: 0,
+        permission: 0,
+        nationLevel: 0,
+        stage: 0,
+        npcMode: 1,
+        generalMeCalls: 0,
+        operations: [],
+        serverTime: '2026-08-13T00:00:35.000Z',
+        serverWallTime: '2026-08-13T00:00:00.000Z',
+        clockMode: 'realtime',
+        clockRunning: true,
+    };
+    await installRealtimeHarness(page);
+    await installFixture(page, state);
+    await page.clock.install({ time: new Date('2026-08-13T00:00:00.000Z') });
+    await page.setViewportSize({ width: 1200, height: 900 });
+    await waitForMain(page);
+    await waitForMainRealtime(page);
+
+    const clock = page.locator('.execution-status');
+    const initialRequestCount = state.trpcRequests?.length ?? 0;
+    await expect(clock).toHaveText('현재 시각: 08-13 09:00');
+    await expect(clock).not.toHaveClass(/execution-status--stale/u);
+
+    await page.clock.runFor(25_000);
+    await expect(clock).toHaveText('현재 시각: 08-13 09:01');
+
+    await page.clock.runFor(21_000);
+    await expect(clock).toHaveClass(/execution-status--stale/u);
+    await expect(clock).toHaveAttribute('title', '최근 45초 동안 서버 통신이 없어 시각 갱신을 멈췄습니다.');
+    await expect.poll(() => clock.evaluate((element) => getComputedStyle(element).color)).toBe('rgb(255, 0, 255)');
+    const staleDesktopGeometry = await clock.evaluate((element) => ({
+        rect: element.getBoundingClientRect().toJSON(),
+        overflow: element.scrollWidth - element.clientWidth,
+        color: getComputedStyle(element).color,
+        fontSize: getComputedStyle(element).fontSize,
+        lineHeight: getComputedStyle(element).lineHeight,
+    }));
+    expect(staleDesktopGeometry.rect.width).toBeCloseTo(333.33, 0);
+    expect(staleDesktopGeometry.rect.height).toBeGreaterThanOrEqual(36);
+    expect(staleDesktopGeometry.overflow).toBeLessThanOrEqual(0);
+    await clock.screenshot({ path: testInfo.outputPath('main-header-clock-stale-desktop-1200.png') });
+    await page.clock.runFor(60_000);
+    await expect(clock).toHaveText('현재 시각: 08-13 09:01');
+
+    await page.evaluate(() => {
+        (window as unknown as { __emitMainRealtime: (type: string, value: unknown) => void }).__emitMainRealtime(
+            'ping',
+            {}
+        );
+    });
+    await expect(clock).toHaveText('현재 시각: 08-13 09:02');
+    await expect(clock).not.toHaveClass(/execution-status--stale/u);
+    await page.clock.runFor(39_000);
+    await expect(clock).toHaveText('현재 시각: 08-13 09:03');
+    await expect.poll(() => clock.evaluate((element) => getComputedStyle(element).color)).toBe('rgb(0, 255, 255)');
+
+    await page.setViewportSize({ width: 500, height: 900 });
+    const freshMobileGeometry = await clock.evaluate((element) => ({
+        rect: element.getBoundingClientRect().toJSON(),
+        overflow: element.scrollWidth - element.clientWidth,
+        color: getComputedStyle(element).color,
+        fontSize: getComputedStyle(element).fontSize,
+        lineHeight: getComputedStyle(element).lineHeight,
+        documentScrollWidth: document.documentElement.scrollWidth,
+    }));
+    expect(freshMobileGeometry.rect.width).toBeCloseTo(166.67, 0);
+    expect(freshMobileGeometry.overflow).toBeLessThanOrEqual(0);
+    expect(freshMobileGeometry.documentScrollWidth).toBe(500);
+    await Promise.all([
+        clock.screenshot({ path: testInfo.outputPath('main-header-clock-fresh-mobile-500.png') }),
+        writeFile(
+            testInfo.outputPath('main-header-clock-geometry.json'),
+            `${JSON.stringify({ staleDesktopGeometry, freshMobileGeometry }, null, 2)}\n`
+        ),
+    ]);
+    expect(state.trpcRequests?.length ?? 0).toBe(initialRequestCount);
+});
+
 test('message targets keep reply behavior and use nation-color contrast in labels and select options', async ({
     page,
 }) => {

app/game-frontend/src/components/main/CommandListPanel.vue

@@ -3,6 +3,7 @@ import { computed, onUnmounted, ref, watch } from 'vue';
 import { addMinutes } from 'date-fns';
 import ReservedCommandEditor from '../command/ReservedCommandEditor.vue';
 import { formatLocalDateTime, formatLocalTimeSeconds } from '../../utils/legacyDateTime';
+import { projectServerClock, sampleServerClock, type SampledServerClock } from '../../utils/serverClockProjection';
 import type {
     CommandMapData,
     CommandMapLayout,
@@ -15,7 +16,7 @@ const props = defineProps<{
     commandTable: CommandTable | null;
     loading: boolean;
     reservedGeneralTurns: Array<{ index: number; action: string; args?: unknown }> | null;
-    general: { id: number; turnTime?: string } | null;
+    general: { id: number; turnTime?: string; nextTurnMonthOffset?: 0 | 1 } | null;
     currentYear?: number;
     currentMonth?: number;
     turnTermMinutes?: number;
@@ -44,13 +45,19 @@ const labelMap = computed(() => {
     return result;
 });
 
+const firstReservedMonth = computed(
+    () =>
+        (props.currentYear ?? 0) * 12 +
+        (props.currentMonth ?? 1) -
+        1 +
+        (props.general?.nextTurnMonthOffset ?? 0)
+);
+
 const rows = computed<ReservedCommandRow[]>(() => {
     const base = props.general?.turnTime ? new Date(props.general.turnTime) : null;
     const term = props.turnTermMinutes ?? 0;
-    const baseYear = props.currentYear ?? 0;
-    const baseMonth = props.currentMonth ?? 1;
     return (props.reservedGeneralTurns ?? []).map((turn, offset) => {
-        const absoluteMonth = baseYear * 12 + baseMonth - 1 + offset;
+        const absoluteMonth = firstReservedMonth.value + offset;
         const date = base && Number.isFinite(base.getTime()) ? addMinutes(base, offset * term) : null;
         return {
             ...turn,
@@ -70,9 +77,7 @@ const rows = computed<ReservedCommandRow[]>(() => {
 
 const autonomousUntil = computed(() => {
     if (props.autorunLimit == null) return null;
-    const baseYear = props.currentYear ?? 0;
+    const currentAbsoluteMonth = firstReservedMonth.value;
-    const baseMonth = props.currentMonth ?? 1;
-    const currentAbsoluteMonth = baseYear * 12 + baseMonth - 1;
     const lastAutonomousMonth = props.autorunLimit - 1;
     if (lastAutonomousMonth < currentAbsoluteMonth) return null;
 
@@ -90,27 +95,20 @@ const autonomousUntil = computed(() => {
 
 const currentServerTime = ref('--:--:--');
 const MAX_SERVER_CLOCK_TIMER_DELAY_MS = 60_000;
-let sampledServerTimeMs: number | null = null;
+let serverClockSample: SampledServerClock | null = null;
-let sampledClientTimeMs = 0;
-let sampledStartDelayMs: number | null = 0;
 let serverClockTimer: ReturnType<typeof setTimeout> | undefined;
 
 const updateServerClock = () => {
     if (serverClockTimer !== undefined) clearTimeout(serverClockTimer);
     serverClockTimer = undefined;
-    if (sampledServerTimeMs === null) {
+    if (serverClockSample === null) {
         currentServerTime.value = '--:--:--';
         return;
     }
-    const clientElapsedMs = Math.max(0, Date.now() - sampledClientTimeMs);
+    const { clientElapsedMs, time: projectedTime } = projectServerClock(serverClockSample);
-    const elapsedGameMs =
-        props.clockMode === 'manual' || sampledStartDelayMs === null
-            ? 0
-            : Math.max(0, clientElapsedMs - sampledStartDelayMs);
-    const projectedTime = new Date(sampledServerTimeMs + elapsedGameMs);
     currentServerTime.value = formatLocalTimeSeconds(projectedTime);
-    if (props.clockMode !== 'manual' && sampledStartDelayMs !== null) {
+    if (serverClockSample.clockMode !== 'manual' && serverClockSample.startDelayMs !== null) {
-        const untilStartMs = sampledStartDelayMs - clientElapsedMs;
+        const untilStartMs = serverClockSample.startDelayMs - clientElapsedMs;
         serverClockTimer = setTimeout(
             updateServerClock,
             untilStartMs > 0
@@ -123,21 +121,7 @@ const updateServerClock = () => {
 watch(
     () => [props.serverTime, props.serverWallTime, props.clockMode, props.clockRunning, props.clockStartsAt] as const,
     ([serverTime, serverWallTime, clockMode, clockRunning, clockStartsAt]) => {
-        const parsed = serverTime ? new Date(serverTime).getTime() : Number.NaN;
+        serverClockSample = sampleServerClock({ serverTime, serverWallTime, clockMode, clockRunning, clockStartsAt });
-        sampledServerTimeMs = Number.isFinite(parsed) ? parsed : null;
-        sampledClientTimeMs = Date.now();
-        if (clockMode === 'manual') {
-            sampledStartDelayMs = null;
-        } else if (clockRunning !== false) {
-            sampledStartDelayMs = 0;
-        } else {
-            const wallTimeMs = serverWallTime ? new Date(serverWallTime).getTime() : Number.NaN;
-            const startsAtMs = clockStartsAt ? new Date(clockStartsAt).getTime() : Number.NaN;
-            sampledStartDelayMs =
-                Number.isFinite(wallTimeMs) && Number.isFinite(startsAtMs)
-                    ? Math.max(0, startsAtMs - wallTimeMs)
-                    : null;
-        }
         updateServerClock();
     },
     { immediate: true }

app/game-frontend/src/components/main/MainFrontStatus.vue

@@ -1,10 +1,26 @@
 <script setup lang="ts">
 import { formatServerDateTime } from '@sammo-ts/common/time/ServerDateTime';
-import { computed } from 'vue';
+import { computed, onUnmounted, ref, watch } from 'vue';
 import { resolveTournamentStageName } from '../../utils/tournamentStatus';
+import {
+    GAME_SERVER_ACTIVITY_FRESHNESS_MS,
+    gameServerActivity,
+    isRecentGameServerActivity,
+} from '../../utils/gameServerActivity';
+import {
+    millisecondsUntilNextMinute,
+    projectServerClock,
+    sampleServerClock,
+    type SampledServerClock,
+} from '../../utils/serverClockProjection';
 
 const props = defineProps<{
     tournamentStage: number;
+    serverTime?: string;
+    serverWallTime?: string;
+    clockMode?: 'realtime' | 'manual';
+    clockRunning?: boolean;
+    clockStartsAt?: string | null;
     status: {
         onlineUserCount: number;
         onlineNations: string;
@@ -20,16 +36,75 @@ const props = defineProps<{
 }>();
 
 const tournamentStatus = computed(() => resolveTournamentStageName(props.tournamentStage));
-const lastExecutedStatus = computed(() =>
+const currentServerTime = ref('기록 없음');
-    formatServerDateTime(props.status?.lastExecuted, { format: 'monthDayTime', fallback: '기록 없음' })
+const hasServerClock = ref(false);
+const serverClockFresh = ref(false);
+const serverClockTitle = computed(() => {
+    if (!hasServerClock.value) return '서버 시각을 아직 받지 못했습니다.';
+    if (!serverClockFresh.value) return '최근 45초 동안 서버 통신이 없어 시각 갱신을 멈췄습니다.';
+    return undefined;
+});
+
+let serverClockSample: SampledServerClock | null = null;
+let serverClockTimer: ReturnType<typeof setTimeout> | undefined;
+
+const updateServerClock = () => {
+    if (serverClockTimer !== undefined) clearTimeout(serverClockTimer);
+    serverClockTimer = undefined;
+    if (serverClockSample === null) {
+        currentServerTime.value = '기록 없음';
+        hasServerClock.value = false;
+        serverClockFresh.value = false;
+        return;
+    }
+
+    const now = Date.now();
+    const projection = projectServerClock(serverClockSample, now);
+    currentServerTime.value = formatServerDateTime(projection.time, {
+        format: 'monthDayTime',
+        fallback: '기록 없음',
+    });
+    hasServerClock.value = true;
+
+    const lastContactAt = gameServerActivity.lastContactAt.value;
+    serverClockFresh.value = isRecentGameServerActivity(lastContactAt, now);
+    if (!serverClockFresh.value || lastContactAt === null) return;
+
+    const nextDelays = [lastContactAt + GAME_SERVER_ACTIVITY_FRESHNESS_MS - now + 1];
+    if (serverClockSample.clockMode !== 'manual' && serverClockSample.startDelayMs !== null) {
+        const untilStartMs = serverClockSample.startDelayMs - projection.clientElapsedMs;
+        nextDelays.push(untilStartMs > 0 ? untilStartMs : millisecondsUntilNextMinute(projection.time));
+    }
+    serverClockTimer = setTimeout(updateServerClock, Math.max(1, Math.min(...nextDelays)));
+};
+
+watch(
+    () => [props.serverTime, props.serverWallTime, props.clockMode, props.clockRunning, props.clockStartsAt] as const,
+    ([serverTime, serverWallTime, clockMode, clockRunning, clockStartsAt]) => {
+        serverClockSample = sampleServerClock({ serverTime, serverWallTime, clockMode, clockRunning, clockStartsAt });
+        updateServerClock();
+    },
+    { immediate: true }
 );
+watch(() => gameServerActivity.lastContactAt.value, updateServerClock);
+
+onUnmounted(() => {
+    if (serverClockTimer !== undefined) clearTimeout(serverClockTimer);
+});
 </script>
 
 <template>
     <section class="front-status" aria-label="접속 현황과 국가 방침">
-        <div class="activity-status" aria-label="동작 시각, 토너먼트와 설문 진행 현황">
+        <div class="activity-status" aria-label="현재 시각, 토너먼트와 설문 진행 현황">
-            <div class="status-row execution-status" :class="{ 'execution-status--empty': !status?.lastExecuted }">
+            <div
-                동작 시각: {{ lastExecutedStatus }}
+                class="status-row execution-status"
+                :class="{
+                    'execution-status--empty': !hasServerClock,
+                    'execution-status--stale': hasServerClock && !serverClockFresh,
+                }"
+                :title="serverClockTitle"
+            >
+                현재 시각: {{ currentServerTime }}
             </div>
             <div class="status-row tournament-status">
                 <RouterLink to="/tournament">
@@ -120,6 +195,10 @@ const lastExecutedStatus = computed(() =>
     color: magenta;
 }
 
+.execution-status--stale {
+    color: magenta;
+}
+
 .vote-label {
     color: cyan;
 }

app/game-frontend/src/stores/mainDashboard.ts

@@ -21,6 +21,7 @@ import {
 import { createBroadcastTabCoordinator, type BroadcastTabCoordinator } from '../utils/broadcastTabCoordinator';
 import { resolveWithReadModelSnapshotFallback } from '../utils/readModelDeltaRecovery';
 import { createRealtimeRequestOptions } from '../utils/realtimeAccessGrant';
+import { markGameServerContact } from '../utils/gameServerActivity';
 
 const REALTIME_FULL_REFRESH_MIN_INTERVAL_MS = 5_000;
 
@@ -1097,10 +1098,12 @@ export const useMainDashboardStore = defineStore('mainDashboard', () => {
             onPayload: (message) => {
                 if (!isRealtimeParticipant()) return;
                 if (message.kind === 'patch') {
+                    markGameServerContact();
                     applyDashboardPatch(message.patch);
                     return;
                 }
                 realtimeStatus.value = message.status;
+                if (message.status === 'connected') markGameServerContact();
             },
         });
         realtimeCoordinator.start();
@@ -1153,6 +1156,7 @@ export const useMainDashboardStore = defineStore('mainDashboard', () => {
         realtimeSource = source;
 
         source.addEventListener('open', () => {
+            markGameServerContact();
             realtimeStatus.value = 'connected';
             realtimeCoordinator?.postFromLeader({ kind: 'status', status: 'connected' });
         });
@@ -1166,6 +1170,7 @@ export const useMainDashboardStore = defineStore('mainDashboard', () => {
             if (!payload || payload.type !== 'readModelInvalidated') {
                 return;
             }
+            markGameServerContact();
             readModelRefreshQueue.request(payload.invalidation, payload.refreshGrant);
         });
         source.addEventListener('messagesInvalidated', (event) => {
@@ -1174,6 +1179,7 @@ export const useMainDashboardStore = defineStore('mainDashboard', () => {
             if (!payload || payload.type !== 'messagesInvalidated') {
                 return;
             }
+            markGameServerContact();
             void refreshMessages(payload.refreshGrant);
         });
 
@@ -1182,14 +1188,17 @@ export const useMainDashboardStore = defineStore('mainDashboard', () => {
         for (const legacyEventType of ['turnCompleted', 'readModelChanged'] as const) {
             source.addEventListener(legacyEventType, () => {
                 if (realtimeCoordinator !== null && !realtimeCoordinator.isLeader()) return;
+                markGameServerContact();
                 realtimeRefreshQueue.request();
             });
         }
         source.addEventListener('messageCreated', () => {
             if (realtimeCoordinator !== null && !realtimeCoordinator.isLeader()) return;
+            markGameServerContact();
             void refreshMessages();
         });
         source.addEventListener('ping', () => {
+            markGameServerContact();
             if (realtimeEnabled.value) {
                 realtimeStatus.value = 'connected';
                 realtimeCoordinator?.postFromLeader({ kind: 'status', status: 'connected' });

app/game-frontend/src/utils/gameServerActivity.ts

@@ -0,0 +1,34 @@
+import { readonly, ref, type Ref } from 'vue';
+
+export const GAME_SERVER_ACTIVITY_FRESHNESS_MS = 45_000;
+
+export type GameServerActivityTracker = {
+    lastContactAt: Readonly<Ref<number | null>>;
+    markContact: (contactAt?: number) => void;
+};
+
+export const createGameServerActivityTracker = (): GameServerActivityTracker => {
+    const lastContactAt = ref<number | null>(null);
+
+    return {
+        lastContactAt: readonly(lastContactAt),
+        markContact(contactAt = Date.now()) {
+            if (!Number.isFinite(contactAt)) return;
+            lastContactAt.value = contactAt;
+        },
+    };
+};
+
+export const isRecentGameServerActivity = (
+    lastContactAt: number | null,
+    now = Date.now(),
+    freshnessMs = GAME_SERVER_ACTIVITY_FRESHNESS_MS
+): boolean =>
+    lastContactAt !== null &&
+    Number.isFinite(lastContactAt) &&
+    Number.isFinite(now) &&
+    Math.max(0, now - lastContactAt) <= freshnessMs;
+
+export const gameServerActivity = createGameServerActivityTracker();
+
+export const markGameServerContact = (contactAt = Date.now()) => gameServerActivity.markContact(contactAt);

app/game-frontend/src/utils/serverClockProjection.ts

@@ -0,0 +1,67 @@
+export type ServerClockProjectionInput = {
+    serverTime?: string;
+    serverWallTime?: string;
+    clockMode?: 'realtime' | 'manual';
+    clockRunning?: boolean;
+    clockStartsAt?: string | null;
+};
+
+export type SampledServerClock = {
+    serverTimeMs: number;
+    sampledClientTimeMs: number;
+    clockMode: 'realtime' | 'manual';
+    startDelayMs: number | null;
+};
+
+const parseInstant = (value?: string | null): number | null => {
+    if (!value) return null;
+    const parsed = new Date(value).getTime();
+    return Number.isFinite(parsed) ? parsed : null;
+};
+
+export const sampleServerClock = (
+    input: ServerClockProjectionInput,
+    sampledClientTimeMs = Date.now()
+): SampledServerClock | null => {
+    const serverTimeMs = parseInstant(input.serverTime);
+    if (serverTimeMs === null) return null;
+
+    let startDelayMs: number | null;
+    if (input.clockMode === 'manual') {
+        startDelayMs = null;
+    } else if (input.clockRunning !== false) {
+        startDelayMs = 0;
+    } else {
+        const serverWallTimeMs = parseInstant(input.serverWallTime);
+        const clockStartsAtMs = parseInstant(input.clockStartsAt);
+        startDelayMs =
+            serverWallTimeMs !== null && clockStartsAtMs !== null
+                ? Math.max(0, clockStartsAtMs - serverWallTimeMs)
+                : null;
+    }
+
+    return {
+        serverTimeMs,
+        sampledClientTimeMs,
+        clockMode: input.clockMode ?? 'realtime',
+        startDelayMs,
+    };
+};
+
+export const projectServerClock = (sample: SampledServerClock, clientTimeMs = Date.now()) => {
+    const clientElapsedMs = Math.max(0, clientTimeMs - sample.sampledClientTimeMs);
+    const elapsedGameMs =
+        sample.clockMode === 'manual' || sample.startDelayMs === null
+            ? 0
+            : Math.max(0, clientElapsedMs - sample.startDelayMs);
+
+    return {
+        clientElapsedMs,
+        time: new Date(sample.serverTimeMs + elapsedGameMs),
+    };
+};
+
+export const millisecondsUntilNextMinute = (time: Date): number => {
+    const remainder = ((time.getTime() % 60_000) + 60_000) % 60_000;
+    return remainder === 0 ? 60_000 : 60_000 - remainder;
+};

app/game-frontend/src/utils/trpc.ts

@@ -3,6 +3,7 @@ import { REALTIME_ACCESS_GRANT_HEADER } from '@sammo-ts/common/realtime/types';
 import { createTRPCProxyClient, httpBatchLink } from '@trpc/client';
 import type { AppRouter } from '@sammo-ts/game-api';
 import { resolveBatchRealtimeAccessGrant } from './realtimeAccessGrant';
+import { markGameServerContact } from './gameServerActivity';
 
 const getGameToken = (): string | null => {
     if (typeof window === 'undefined') {
@@ -17,6 +18,11 @@ export const trpc = createTRPCProxyClient<AppRouter>({
         httpBatchLink({
             url: import.meta.env.VITE_GAME_API_URL ?? '/api/trpc',
             ...trpcJsonBodyHttpClientOptions,
+            async fetch(input, init) {
+                const result = await globalThis.fetch(input, init);
+                markGameServerContact();
+                return result;
+            },
             headers({ opList }) {
                 const token = getGameToken();
                 const refreshGrant = resolveBatchRealtimeAccessGrant(opList);

app/game-frontend/src/views/MainView.vue

@@ -243,7 +243,15 @@ watch(
         </div>
 
         <div data-main-target="policy">
-            <MainFrontStatus :status="frontStatus" :tournament-stage="tournamentStage" />
+            <MainFrontStatus
+                :status="frontStatus"
+                :tournament-stage="tournamentStage"
+                :server-time="lobbyInfo?.serverTime"
+                :server-wall-time="lobbyInfo?.serverWallTime"
+                :clock-mode="lobbyInfo?.clockMode"
+                :clock-running="lobbyInfo?.clockRunning"
+                :clock-starts-at="lobbyInfo?.clockStartsAt"
+            />
         </div>
 
         <aside v-if="surveyNotice" class="survey-notice" role="status" aria-live="polite">

app/game-frontend/test/gameServerActivity.test.ts

@@ -0,0 +1,22 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+    GAME_SERVER_ACTIVITY_FRESHNESS_MS,
+    createGameServerActivityTracker,
+    isRecentGameServerActivity,
+} from '../src/utils/gameServerActivity.ts';
+
+void test('keeps the most recently observed server contact timestamp', () => {
+    const tracker = createGameServerActivityTracker();
+    tracker.markContact(2_000);
+    tracker.markContact(1_000);
+    tracker.markContact(Number.NaN);
+    assert.equal(tracker.lastContactAt.value, 1_000);
+});
+
+void test('treats three heartbeat intervals as recent activity', () => {
+    assert.equal(isRecentGameServerActivity(1_000, 1_000 + GAME_SERVER_ACTIVITY_FRESHNESS_MS), true);
+    assert.equal(isRecentGameServerActivity(1_000, 1_001 + GAME_SERVER_ACTIVITY_FRESHNESS_MS), false);
+    assert.equal(isRecentGameServerActivity(null, 1_000), false);
+});

app/game-frontend/test/serverClockProjection.test.ts

@@ -0,0 +1,51 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+    millisecondsUntilNextMinute,
+    projectServerClock,
+    sampleServerClock,
+} from '../src/utils/serverClockProjection.ts';
+
+void test('projects a running server clock from the browser sample instant', () => {
+    const sample = sampleServerClock(
+        {
+            serverTime: '2026-08-13T00:00:35.250Z',
+            clockMode: 'realtime',
+            clockRunning: true,
+        },
+        10_000
+    );
+    assert.ok(sample);
+    assert.equal(projectServerClock(sample, 34_750).time.toISOString(), '2026-08-13T00:01:00.000Z');
+    assert.equal(millisecondsUntilNextMinute(projectServerClock(sample, 10_000).time), 24_750);
+});
+
+void test('keeps manual clocks fixed even while client time advances', () => {
+    const sample = sampleServerClock(
+        { serverTime: '2026-08-13T00:00:35.000Z', clockMode: 'manual', clockRunning: false },
+        10_000
+    );
+    assert.ok(sample);
+    assert.equal(projectServerClock(sample, 130_000).time.toISOString(), '2026-08-13T00:00:35.000Z');
+});
+
+void test('holds a preopen clock until its wall-clock start delay passes', () => {
+    const sample = sampleServerClock(
+        {
+            serverTime: '2026-08-13T00:00:00.000Z',
+            serverWallTime: '2026-08-13T08:00:00.000Z',
+            clockMode: 'realtime',
+            clockRunning: false,
+            clockStartsAt: '2026-08-13T08:01:00.000Z',
+        },
+        10_000
+    );
+    assert.ok(sample);
+    assert.equal(projectServerClock(sample, 69_999).time.toISOString(), '2026-08-13T00:00:00.000Z');
+    assert.equal(projectServerClock(sample, 70_001).time.toISOString(), '2026-08-13T00:00:00.001Z');
+});
+
+void test('rejects an invalid server clock sample', () => {
+    assert.equal(sampleServerClock({ serverTime: 'not-a-time' }, 10_000), null);
+});