diff --git a/core/src/host/project-board.js b/core/src/host/project-board.js
index f904a331..1fe29775 100644
--- a/core/src/host/project-board.js
+++ b/core/src/host/project-board.js
@@ -107,6 +107,13 @@ const ONE_LINE = 200
 // queue reason the panel draws, which reads as a replacement character.
 const oneLine = value => (typeof value === 'string' ? cut(value.replace(/\s+/g, ' ').trim(), ONE_LINE).text : '')
 const stampOf = value => (Number.isFinite(value) ? value : null)
+// #2587: `text()` proves only that a stored timestamp is a non-empty string, so a hand-edited
+// `decidedAt` / `createdAt` reached `toISOString()` and threw for the whole board read. A value
+// that does not parse reads as no date, like the other unreadable fields.
+const dayOf = value => {
+  const parsed = Date.parse(text(value))
+  return Number.isFinite(parsed) ? new Date(parsed).toISOString().slice(0, 10) : ''
+}
 
 // Waiting: an open card a role may claim and no member has. `waitedMs` is measured from the card's
 // own `createdAt`, so the board shows a duration a reader can check, not a guess.
@@ -400,7 +407,7 @@ export function install(rt) {
         const pastCut = file === undefined && decisions.known?.has(named) === true
         decided.push({
           id,
-          date: text(meeting.decidedAt) !== '' ? new Date(meeting.decidedAt).toISOString().slice(0, 10) : '',
+          date: dayOf(meeting.decidedAt),
           question,
           owner: text(meeting.owner) || null,
           ...cardOf(meeting),
@@ -414,7 +421,7 @@ export function install(rt) {
       if (meeting.status === 'open' || meeting.status === 'deliberating' || meeting.status === 'blocked') {
         pending.push({
           id,
-          date: text(meeting.createdAt) !== '' ? new Date(meeting.createdAt).toISOString().slice(0, 10) : '',
+          date: dayOf(meeting.createdAt),
           question,
           status: meeting.status,
           ...cardOf(meeting),
diff --git a/core/test/project-board-meeting-date.test.js b/core/test/project-board-meeting-date.test.js
new file mode 100644
index 00000000..d0378628
--- /dev/null
+++ b/core/test/project-board-meeting-date.test.js
@@ -0,0 +1,92 @@
+// #2587: a `meetings` record whose `decidedAt` / `createdAt` is a non-date string is state an
+// older version or a hand edit can leave behind. `text()` only proves the value is a non-empty
+// string, so the date line fed `new Date(value).toISOString()` and threw
+// `RangeError: Invalid time value` for the whole board read. The meeting now lists with an empty
+// date, like the other unreadable fields, and the rest of the board still renders.
+import assert from 'node:assert/strict'
+import { mkdtempSync, rmSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { test } from 'node:test'
+import { createRuntime, provideFlyBot } from '../index.js'
+import { fakeContext } from './fake-ctx.js'
+
+const seed = () => ({
+  version: 2,
+  revision: 1,
+  mainBotIds: ['a'],
+  members: { 'owner-1': { id: 'owner-1', createdAt: 1, designatedChiefId: 'a' } },
+  bots: {
+    a: { id: 'a', name: 'Chief', role: 'Boss', sessionId: 'a', createdAt: 1, ownerId: 'owner-1' },
+  },
+  rooms: { r1: { id: 'r1', name: 'Ops', members: ['a'], mode: 'admin', admin: 'a', named: true, sessions: {}, log: [], seq: 0, seen: {}, projectId: 'project-p1' } },
+  agents: {}, exchanges: [], exchangeTurns: {}, questions: {}, prefs: {}, grants: {},
+  projects: {
+    'project-p1': { id: 'project-p1', name: 'P1', repository: 'ThinkFlowLab/FlyBot', defaultBranch: 'main', ownerUserId: 'owner-1', createdAt: 1, updatedAt: 1, status: 'active' },
+  },
+  projectRuns: {},
+  tasks: {
+    'task-group': { id: 'task-group', kind: 'group', status: 'working', ownerBotId: 'a', origin: { roomId: 'r1' }, assignee: 'Writer', title: 'Ship it', createdAt: 5, updatedAt: 10 },
+  },
+  meetings: {
+    // The decided meeting carries the unparseable timestamp the old record may hold.
+    m1: { id: 'm1', project: 'project-p1', status: 'decided', question: 'Adopt the record?', decidedAt: 'not-a-date', updatedAt: 10 },
+    // The pending list reads `createdAt` on its own line; it must guard the same way.
+    m2: { id: 'm2', project: 'project-p1', status: 'open', question: 'Still open?', createdAt: 'not-a-time', updatedAt: 11 },
+    // A readable timestamp still formats, so the guard does not blank every date.
+    m3: { id: 'm3', project: 'project-p1', status: 'decided', question: 'Keep the date?', decidedAt: '2026-11-01T09:00:00.000Z', updatedAt: 12 },
+  },
+})
+
+async function start() {
+  const home = mkdtempSync(join(tmpdir(), 'ds-bot-board-'))
+  writeFileSync(join(home, 'state.json'), JSON.stringify(seed()))
+  const ctx = fakeContext()
+  let route
+  const agents = new Map()
+  const agentOf = (sessionId) => {
+    if (!agents.has(sessionId)) agents.set(sessionId, { session: { id: sessionId }, followup() {}, steer() {}, inject() {}, cancel() {}, whenIdle() {}, inbox: { nextStep: [], nextTurn: [], remove() {} } })
+    return agents.get(sessionId)
+  }
+  Object.assign(ctx, {
+    llm: { listProviders: () => [], listModels: async () => [], resolveModelInfo: async () => ({}) },
+    workspaceRegistry: { get: () => undefined, resolveByPath: async () => undefined, create: async path => ({ id: 'w1', path }), archiveSession: async () => {} },
+    sessionController: { create: async () => ({ sessionId: 's1' }), resolveAgent: async id => ({ agent: agentOf(id) }), selectModel: async () => {} },
+    sessionTitle: { rename: async () => {} },
+    sessions: { flush: async () => {} },
+  })
+  const register = ctx.connection.fetch.register
+  ctx.connection.fetch.register = (options) => { route = options; return register(options) }
+  const rt = createRuntime(ctx, { home })
+  provideFlyBot(ctx, rt.flybot)
+  await rt.load()
+  const call = async (endpoint, payload) => (await route.fetch(new Request('http://localhost/api/bot', { method: 'POST', body: JSON.stringify({ endpoint, payload }) }))).json()
+  const stop = async () => {
+    await ctx.dispose()
+    rmSync(home, { recursive: true, force: true, maxRetries: 5 })
+  }
+  return { call, rt, stop }
+}
+
+test('#2587: a meetings record with a non-date decidedAt does not break the board read', async () => {
+  const { rt, call, stop } = await start()
+  try {
+    const board = await rt.projectBoard('project-p1')
+    const decided = board.meetings.decided.find(meeting => meeting.id === 'm1')
+    assert.ok(decided, 'the decided meeting is still listed')
+    assert.equal(decided.date, '', 'an unreadable decidedAt reads as no date')
+    const pending = board.meetings.pending.find(meeting => meeting.id === 'm2')
+    assert.ok(pending, 'the pending meeting is still listed')
+    assert.equal(pending.date, '', 'an unreadable createdAt reads as no date')
+    const dated = board.meetings.decided.find(meeting => meeting.id === 'm3')
+    assert.equal(dated.date, '2026-11-01', 'a readable timestamp still formats')
+    assert.deepEqual(board.rows.map(row => row.id), ['task-group'], 'the rest of the board still renders')
+    // The endpoint the page uses answers the same board, not an error.
+    const served = await call('project-board', { id: 'project-p1' })
+    assert.equal(served.ok, true, JSON.stringify(served))
+    assert.deepEqual(served.value.tasks.map(row => row.id), ['task-group'])
+    assert.equal(served.value.meetings.decided.find(meeting => meeting.id === 'm1').date, '')
+  } finally {
+    await stop()
+  }
+})
diff --git a/patches/ds-bot/files/src/host/project-board.js b/patches/ds-bot/files/src/host/project-board.js
index f904a331..1fe29775 100644
--- a/patches/ds-bot/files/src/host/project-board.js
+++ b/patches/ds-bot/files/src/host/project-board.js
@@ -107,6 +107,13 @@ const ONE_LINE = 200
 // queue reason the panel draws, which reads as a replacement character.
 const oneLine = value => (typeof value === 'string' ? cut(value.replace(/\s+/g, ' ').trim(), ONE_LINE).text : '')
 const stampOf = value => (Number.isFinite(value) ? value : null)
+// #2587: `text()` proves only that a stored timestamp is a non-empty string, so a hand-edited
+// `decidedAt` / `createdAt` reached `toISOString()` and threw for the whole board read. A value
+// that does not parse reads as no date, like the other unreadable fields.
+const dayOf = value => {
+  const parsed = Date.parse(text(value))
+  return Number.isFinite(parsed) ? new Date(parsed).toISOString().slice(0, 10) : ''
+}
 
 // Waiting: an open card a role may claim and no member has. `waitedMs` is measured from the card's
 // own `createdAt`, so the board shows a duration a reader can check, not a guess.
@@ -400,7 +407,7 @@ export function install(rt) {
         const pastCut = file === undefined && decisions.known?.has(named) === true
         decided.push({
           id,
-          date: text(meeting.decidedAt) !== '' ? new Date(meeting.decidedAt).toISOString().slice(0, 10) : '',
+          date: dayOf(meeting.decidedAt),
           question,
           owner: text(meeting.owner) || null,
           ...cardOf(meeting),
@@ -414,7 +421,7 @@ export function install(rt) {
       if (meeting.status === 'open' || meeting.status === 'deliberating' || meeting.status === 'blocked') {
         pending.push({
           id,
-          date: text(meeting.createdAt) !== '' ? new Date(meeting.createdAt).toISOString().slice(0, 10) : '',
+          date: dayOf(meeting.createdAt),
           question,
           status: meeting.status,
           ...cardOf(meeting),
diff --git a/patches/ds-bot/files/test/project-board-meeting-date.test.js b/patches/ds-bot/files/test/project-board-meeting-date.test.js
new file mode 100644
index 00000000..d0378628
--- /dev/null
+++ b/patches/ds-bot/files/test/project-board-meeting-date.test.js
@@ -0,0 +1,92 @@
+// #2587: a `meetings` record whose `decidedAt` / `createdAt` is a non-date string is state an
+// older version or a hand edit can leave behind. `text()` only proves the value is a non-empty
+// string, so the date line fed `new Date(value).toISOString()` and threw
+// `RangeError: Invalid time value` for the whole board read. The meeting now lists with an empty
+// date, like the other unreadable fields, and the rest of the board still renders.
+import assert from 'node:assert/strict'
+import { mkdtempSync, rmSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { test } from 'node:test'
+import { createRuntime, provideFlyBot } from '../index.js'
+import { fakeContext } from './fake-ctx.js'
+
+const seed = () => ({
+  version: 2,
+  revision: 1,
+  mainBotIds: ['a'],
+  members: { 'owner-1': { id: 'owner-1', createdAt: 1, designatedChiefId: 'a' } },
+  bots: {
+    a: { id: 'a', name: 'Chief', role: 'Boss', sessionId: 'a', createdAt: 1, ownerId: 'owner-1' },
+  },
+  rooms: { r1: { id: 'r1', name: 'Ops', members: ['a'], mode: 'admin', admin: 'a', named: true, sessions: {}, log: [], seq: 0, seen: {}, projectId: 'project-p1' } },
+  agents: {}, exchanges: [], exchangeTurns: {}, questions: {}, prefs: {}, grants: {},
+  projects: {
+    'project-p1': { id: 'project-p1', name: 'P1', repository: 'ThinkFlowLab/FlyBot', defaultBranch: 'main', ownerUserId: 'owner-1', createdAt: 1, updatedAt: 1, status: 'active' },
+  },
+  projectRuns: {},
+  tasks: {
+    'task-group': { id: 'task-group', kind: 'group', status: 'working', ownerBotId: 'a', origin: { roomId: 'r1' }, assignee: 'Writer', title: 'Ship it', createdAt: 5, updatedAt: 10 },
+  },
+  meetings: {
+    // The decided meeting carries the unparseable timestamp the old record may hold.
+    m1: { id: 'm1', project: 'project-p1', status: 'decided', question: 'Adopt the record?', decidedAt: 'not-a-date', updatedAt: 10 },
+    // The pending list reads `createdAt` on its own line; it must guard the same way.
+    m2: { id: 'm2', project: 'project-p1', status: 'open', question: 'Still open?', createdAt: 'not-a-time', updatedAt: 11 },
+    // A readable timestamp still formats, so the guard does not blank every date.
+    m3: { id: 'm3', project: 'project-p1', status: 'decided', question: 'Keep the date?', decidedAt: '2026-11-01T09:00:00.000Z', updatedAt: 12 },
+  },
+})
+
+async function start() {
+  const home = mkdtempSync(join(tmpdir(), 'ds-bot-board-'))
+  writeFileSync(join(home, 'state.json'), JSON.stringify(seed()))
+  const ctx = fakeContext()
+  let route
+  const agents = new Map()
+  const agentOf = (sessionId) => {
+    if (!agents.has(sessionId)) agents.set(sessionId, { session: { id: sessionId }, followup() {}, steer() {}, inject() {}, cancel() {}, whenIdle() {}, inbox: { nextStep: [], nextTurn: [], remove() {} } })
+    return agents.get(sessionId)
+  }
+  Object.assign(ctx, {
+    llm: { listProviders: () => [], listModels: async () => [], resolveModelInfo: async () => ({}) },
+    workspaceRegistry: { get: () => undefined, resolveByPath: async () => undefined, create: async path => ({ id: 'w1', path }), archiveSession: async () => {} },
+    sessionController: { create: async () => ({ sessionId: 's1' }), resolveAgent: async id => ({ agent: agentOf(id) }), selectModel: async () => {} },
+    sessionTitle: { rename: async () => {} },
+    sessions: { flush: async () => {} },
+  })
+  const register = ctx.connection.fetch.register
+  ctx.connection.fetch.register = (options) => { route = options; return register(options) }
+  const rt = createRuntime(ctx, { home })
+  provideFlyBot(ctx, rt.flybot)
+  await rt.load()
+  const call = async (endpoint, payload) => (await route.fetch(new Request('http://localhost/api/bot', { method: 'POST', body: JSON.stringify({ endpoint, payload }) }))).json()
+  const stop = async () => {
+    await ctx.dispose()
+    rmSync(home, { recursive: true, force: true, maxRetries: 5 })
+  }
+  return { call, rt, stop }
+}
+
+test('#2587: a meetings record with a non-date decidedAt does not break the board read', async () => {
+  const { rt, call, stop } = await start()
+  try {
+    const board = await rt.projectBoard('project-p1')
+    const decided = board.meetings.decided.find(meeting => meeting.id === 'm1')
+    assert.ok(decided, 'the decided meeting is still listed')
+    assert.equal(decided.date, '', 'an unreadable decidedAt reads as no date')
+    const pending = board.meetings.pending.find(meeting => meeting.id === 'm2')
+    assert.ok(pending, 'the pending meeting is still listed')
+    assert.equal(pending.date, '', 'an unreadable createdAt reads as no date')
+    const dated = board.meetings.decided.find(meeting => meeting.id === 'm3')
+    assert.equal(dated.date, '2026-11-01', 'a readable timestamp still formats')
+    assert.deepEqual(board.rows.map(row => row.id), ['task-group'], 'the rest of the board still renders')
+    // The endpoint the page uses answers the same board, not an error.
+    const served = await call('project-board', { id: 'project-p1' })
+    assert.equal(served.ok, true, JSON.stringify(served))
+    assert.deepEqual(served.value.tasks.map(row => row.id), ['task-group'])
+    assert.equal(served.value.meetings.decided.find(meeting => meeting.id === 'm1').date, '')
+  } finally {
+    await stop()
+  }
+})