{ "connections": { "Build Sync Actions": { "main": [ [ { "index": 0, "node": "Route Action", "type": "main" } ] ] }, "Combine Calendars": { "main": [ [ { "index": 0, "node": "Build Sync Actions", "type": "main" } ] ] }, "Hourly Reconcile": { "main": [ [ { "index": 0, "node": "List Personal Events", "type": "main" }, { "index": 0, "node": "List Work Calendar A Events", "type": "main" }, { "index": 0, "node": "List Work Calendar B Events", "type": "main" } ] ] }, "List Personal Events": { "main": [ [ { "index": 0, "node": "Mark Personal Events", "type": "main" } ] ] }, "List Work Calendar A Events": { "main": [ [ { "index": 0, "node": "Mark Work Calendar A Events", "type": "main" } ] ] }, "List Work Calendar B Events": { "main": [ [ { "index": 0, "node": "Mark Work Calendar B Events", "type": "main" } ] ] }, "Mark Personal Events": { "main": [ [ { "index": 0, "node": "Combine Calendars", "type": "main" } ] ] }, "Mark Work Calendar A Events": { "main": [ [ { "index": 1, "node": "Combine Calendars", "type": "main" } ] ] }, "Mark Work Calendar B Events": { "main": [ [ { "index": 2, "node": "Combine Calendars", "type": "main" } ] ] }, "Route Action": { "main": [ [ { "index": 0, "node": "Create Work Calendar A Block", "type": "main" } ], [ { "index": 0, "node": "Update Work Calendar A Block", "type": "main" } ], [ { "index": 0, "node": "Delete Work Calendar A Block", "type": "main" } ], [ { "index": 0, "node": "Create Work Calendar B Block", "type": "main" } ], [ { "index": 0, "node": "Update Work Calendar B Block", "type": "main" } ], [ { "index": 0, "node": "Delete Work Calendar B Block", "type": "main" } ] ] } }, "name": "Calendar Sync across Accounts", "nodes": [ { "name": "Hourly Reconcile", "parameters": { "rule": { "interval": [ { "field": "hours", "triggerAtMinute": 13 } ] } }, "position": [ -720, 0 ], "type": "n8n-nodes-base.scheduleTrigger", "typeVersion": 1.3 }, { "alwaysOutputData": true, "name": "List Personal Events", "parameters": { "calendar": "public-calendar-placeholder", "operation": "getAll", "options": { "orderBy": "startTime", "singleEvents": true, "timeMax": "={{ DateTime.now().startOf('day').plus({ days: 15 }).toISO() }}", "timeMin": "={{ DateTime.now().startOf('day').toISO() }}" }, "returnAll": true }, "position": [ -480, -240 ], "type": "n8n-nodes-base.googleCalendar", "typeVersion": 1 }, { "alwaysOutputData": true, "name": "List Work Calendar A Events", "parameters": { "calendar": "public-calendar-placeholder", "operation": "getAll", "options": {}, "returnAll": true, "timeMax": "={{ DateTime.now().startOf('day').plus({ days: 15 }).toISO() }}", "timeMin": "={{ DateTime.now().startOf('day').toISO() }}" }, "position": [ -480, 0 ], "type": "n8n-nodes-base.googleCalendar", "typeVersion": 1.3 }, { "alwaysOutputData": true, "name": "List Work Calendar B Events", "parameters": { "calendar": "public-calendar-placeholder", "operation": "getAll", "options": {}, "returnAll": true, "timeMax": "={{ DateTime.now().startOf('day').plus({ days: 15 }).toISO() }}", "timeMin": "={{ DateTime.now().startOf('day').toISO() }}" }, "position": [ -480, 240 ], "type": "n8n-nodes-base.googleCalendar", "typeVersion": 1.3 }, { "name": "Mark Personal Events", "parameters": { "jsCode": "return $input.all().filter(item => item.json.id).map(item => ({ json: { ...item.json, _calendarId: 'user@example.invalid' } }));" }, "position": [ -240, -240 ], "type": "n8n-nodes-base.code", "typeVersion": 2 }, { "name": "Mark Work Calendar A Events", "parameters": { "jsCode": "return $input.all().filter(item => item.json.id).map(item => ({ json: { ...item.json, _calendarId: 'user@example.invalid' } }));" }, "position": [ -240, 0 ], "type": "n8n-nodes-base.code", "typeVersion": 2 }, { "name": "Mark Work Calendar B Events", "parameters": { "jsCode": "return $input.all().filter(item => item.json.id).map(item => ({ json: { ...item.json, _calendarId: 'user@example.invalid' } }));" }, "position": [ -240, 240 ], "type": "n8n-nodes-base.code", "typeVersion": 2 }, { "alwaysOutputData": true, "name": "Combine Calendars", "parameters": { "numberInputs": 3 }, "position": [ 0, 0 ], "type": "n8n-nodes-base.merge", "typeVersion": 3.2 }, { "name": "Build Sync Actions", "parameters": { "jsCode": "const WORKFLOW_ID = 'Z57OBF7ctGcsLiJc';\nconst SYNC_MARKER = 'n8n-ed-calendar-sync';\nconst MARKER_VERSION = '2';\nconst TIME_ZONE = 'America/Chicago';\nconst WORKDAY_START_HOUR = 7;\nconst WORKDAY_END_HOUR = 19;\nconst MAX_ACTIONS_PER_RUN = 10;\n\nconst CALENDARS = {\n personal: 'user@example.invalid',\n \"Work Calendar A\": 'user@example.invalid',\n \"Work Calendar B\": 'user@example.invalid',\n};\n\nconst CALENDAR_REFS = {\n [CALENDARS.personal]: '00000000-0000-4000-8000-000000000000',\n [CALENDARS[\"Work Calendar A\"]]: '00000000-0000-4000-8000-000000000000',\n [CALENDARS[\"Work Calendar B\"]]: '00000000-0000-4000-8000-000000000000',\n};\n\nconst CALENDAR_IDS_BY_REF = Object.fromEntries(\n Object.entries(CALENDAR_REFS).map(([calendarId, ref]) => [ref, calendarId]),\n);\n\nconst DESTINATIONS = [\n {\n alias: 'Work Calendar A',\n calendarId: CALENDARS[\"Work Calendar A\"],\n sourceCalendarIds: [CALENDARS.personal, CALENDARS[\"Work Calendar B\"]],\n },\n {\n alias: 'Work Calendar B',\n calendarId: CALENDARS[\"Work Calendar B\"],\n sourceCalendarIds: [CALENDARS.personal, CALENDARS[\"Work Calendar A\"]],\n },\n];\n\nfunction asDateTime(value, dateOnly = false) {\n if (!value) return null;\n if (dateOnly) return DateTime.fromISO(value, { zone: TIME_ZONE }).startOf('day');\n return DateTime.fromISO(value, { zone: TIME_ZONE });\n}\n\nfunction eventStart(event) {\n return asDateTime(event.start?.dateTime, false) || asDateTime(event.start?.date, true);\n}\n\nfunction eventEnd(event) {\n return asDateTime(event.end?.dateTime, false) || asDateTime(event.end?.date, true);\n}\n\nfunction legacySourceBaseKey(event) {\n const originalStart = event.originalStartTime?.dateTime || event.originalStartTime?.date || event.start?.dateTime || event.start?.date || '';\n return [event.recurringEventId || event.id, originalStart].filter(Boolean).join('@');\n}\n\nfunction sourceBaseKey(event) {\n return [event._calendarId, legacySourceBaseKey(event)].filter(Boolean).join(':');\n}\n\nfunction markerPayload(desired) {\n return {\n workflowId: WORKFLOW_ID,\n markerVersion: MARKER_VERSION,\n sourceCalendarId: desired.sourceCalendarId,\n sourceEventId: desired.sourceEventId,\n sourceKey: desired.sourceKey,\n destinationCalendarId: desired.destinationCalendarId,\n };\n}\n\nfunction markerFor(desired) {\n return ``;\n}\n\nfunction isAllDay(event) {\n return Boolean(event.start?.date || event.end?.date) && !event.start?.dateTime;\n}\n\nfunction parseMarker(event) {\n const ext = event.extendedProperties?.private || {};\n if (ext.workflowId === WORKFLOW_ID && ext.sourceKey) {\n return {\n workflowId: WORKFLOW_ID,\n markerVersion: String(ext.markerVersion || '1'),\n sourceCalendarId: ext.sourceCalendarId || CALENDARS.personal,\n sourceEventId: ext.sourceEventId || '',\n sourceKey: ext.sourceKey,\n destinationCalendarId: ext.destinationCalendarId || event._calendarId || CALENDARS[\"Work Calendar A\"],\n };\n }\n\n const description = event.description || '';\n const match = description.match(//);\n if (!match) return null;\n\n try {\n const parsed = JSON.parse(match[1]);\n if (parsed.workflowId !== WORKFLOW_ID) return null;\n const sourceCalendarId = parsed.sourceCalendarId || CALENDAR_IDS_BY_REF[parsed.sourceCalendarRef] || CALENDARS.personal;\n const destinationCalendarId = parsed.destinationCalendarId || CALENDAR_IDS_BY_REF[parsed.destinationCalendarRef] || event._calendarId || CALENDARS[\"Work Calendar A\"];\n return {\n workflowId: WORKFLOW_ID,\n markerVersion: String(parsed.markerVersion || '1'),\n managedOnly: !parsed.sourceKey,\n sourceCalendarId,\n sourceEventId: parsed.sourceEventId || '',\n sourceKey: parsed.sourceKey || '',\n destinationCalendarId,\n };\n } catch {\n return null;\n }\n}\n\nfunction isManagedEvent(event) {\n return Boolean(parseMarker(event));\n}\n\nfunction mappingKey(destinationCalendarId, sourceCalendarId, sourceKey) {\n return [destinationCalendarId, sourceCalendarId, sourceKey].join('>');\n}\n\nfunction blockSummary(desired) {\n if (desired.destinationCalendarId !== CALENDARS[\"Work Calendar B\"]) return 'Unavailable';\n if (desired.sourceCalendarId === CALENDARS[\"Work Calendar A\"]) return 'Unavailable (Work Calendar A)';\n if (desired.sourceCalendarId === CALENDARS.personal) return 'Unavailable (Personal)';\n return 'Unavailable';\n}\n\nfunction blockVisibility(desired) {\n return desired.destinationCalendarId === CALENDARS[\"Work Calendar B\"] ? 'default' : 'private';\n}\n\nfunction buildBody(desired) {\n return {\n summary: blockSummary(desired),\n description: [\n markerFor(desired),\n `Source event ID: ${desired.sourceEventId}`,\n `Source calendar: ${CALENDAR_REFS[desired.sourceCalendarId] || 'unknown'}`,\n ].join('\\n'),\n start: {\n dateTime: desired.start,\n timeZone: TIME_ZONE,\n },\n end: {\n dateTime: desired.end,\n timeZone: TIME_ZONE,\n },\n visibility: blockVisibility(desired),\n transparency: 'opaque',\n reminders: {\n useDefault: false,\n },\n extendedProperties: {\n private: markerPayload(desired),\n },\n };\n}\n\nfunction sameInstant(a, b) {\n const left = DateTime.fromISO(a, { zone: TIME_ZONE });\n const right = DateTime.fromISO(b, { zone: TIME_ZONE });\n return left.isValid && right.isValid && left.toMillis() === right.toMillis();\n}\n\nfunction effectiveTransparency(event) {\n return event.transparency || 'opaque';\n}\n\nfunction effectiveVisibility(event) {\n return event.visibility || 'default';\n}\n\nfunction destinationMatches(destination, desired, body) {\n const start = destination.start?.dateTime;\n const end = destination.end?.dateTime;\n const ext = destination.extendedProperties?.private || {};\n return (\n destination.summary === body.summary &&\n destination.description === body.description &&\n effectiveVisibility(destination) === body.visibility &&\n effectiveTransparency(destination) === body.transparency &&\n ext.workflowId === WORKFLOW_ID &&\n String(ext.markerVersion) === MARKER_VERSION &&\n ext.sourceCalendarId === desired.sourceCalendarId &&\n ext.sourceKey === desired.sourceKey &&\n ext.sourceEventId === desired.sourceEventId &&\n ext.destinationCalendarId === desired.destinationCalendarId &&\n start &&\n end &&\n sameInstant(start, desired.start) &&\n sameInstant(end, desired.end)\n );\n}\n\nfunction desiredSegments(event, destination) {\n if (isManagedEvent(event)) return [];\n if (event.status === 'cancelled') return [];\n if (isAllDay(event)) return [];\n if (event.transparency === 'transparent') return [];\n if (!event._calendarId || event._calendarId === destination.calendarId) return [];\n if (!destination.sourceCalendarIds.includes(event._calendarId)) return [];\n\n const start = eventStart(event);\n const end = eventEnd(event);\n if (!start?.isValid || !end?.isValid || end <= start) return [];\n\n const segments = [];\n const baseKey = sourceBaseKey(event);\n const legacyBaseKey = legacySourceBaseKey(event);\n let day = start.setZone(TIME_ZONE).startOf('day');\n const lastDay = end.setZone(TIME_ZONE).minus({ milliseconds: 1 }).startOf('day');\n\n while (day <= lastDay) {\n const windowStart = day.plus({ hours: WORKDAY_START_HOUR });\n const windowEnd = day.plus({ hours: WORKDAY_END_HOUR });\n const clippedStart = start > windowStart ? start : windowStart;\n const clippedEnd = end < windowEnd ? end : windowEnd;\n const isWeekday = day.weekday >= 1 && day.weekday <= 5;\n\n if (isWeekday && clippedStart < clippedEnd) {\n const dayKey = day.toISODate();\n const legacySourceKey = `${legacyBaseKey}#${dayKey}`;\n segments.push({\n destinationAlias: destination.alias,\n destinationCalendarId: destination.calendarId,\n sourceCalendarId: event._calendarId,\n sourceKey: `${baseKey}#${dayKey}`,\n legacySourceKey: event._calendarId === CALENDARS.personal && destination.calendarId === CALENDARS[\"Work Calendar A\"] ? legacySourceKey : null,\n sourceEventId: event.id,\n start: clippedStart.toISO(),\n end: clippedEnd.toISO(),\n });\n }\n\n day = day.plus({ days: 1 });\n }\n\n return segments;\n}\n\nconst allEvents = $input.all().map(item => item.json).filter(event => event.id && event._calendarId);\nconst actions = [];\n\nfor (const destination of DESTINATIONS) {\n const desiredByKey = new Map();\n for (const event of allEvents) {\n for (const segment of desiredSegments(event, destination)) {\n desiredByKey.set(mappingKey(segment.destinationCalendarId, segment.sourceCalendarId, segment.sourceKey), segment);\n }\n }\n\n const destinationByKey = new Map();\n const duplicateDestinations = [];\n for (const event of allEvents.filter(candidate => candidate._calendarId === destination.calendarId)) {\n const marker = parseMarker(event);\n if (!marker || marker.managedOnly || marker.destinationCalendarId !== destination.calendarId) continue;\n\n const key = mappingKey(marker.destinationCalendarId, marker.sourceCalendarId, marker.sourceKey);\n if (destinationByKey.has(key)) {\n duplicateDestinations.push(event);\n } else {\n destinationByKey.set(key, event);\n }\n }\n\n const matchedDestinationIds = new Set();\n\n for (const [desiredKey, desired] of desiredByKey) {\n const legacyKey = desired.legacySourceKey\n ? mappingKey(desired.destinationCalendarId, desired.sourceCalendarId, desired.legacySourceKey)\n : null;\n const destinationEvent = destinationByKey.get(desiredKey) || (legacyKey ? destinationByKey.get(legacyKey) : null);\n const body = buildBody(desired);\n\n if (!destinationEvent) {\n actions.push({\n action: 'create',\n route: `create:${destination.alias}`,\n destinationCalendarId: destination.calendarId,\n sourceKey: desired.sourceKey,\n body,\n });\n continue;\n }\n\n matchedDestinationIds.add(destinationEvent.id);\n if (!destinationMatches(destinationEvent, desired, body)) {\n actions.push({\n action: 'update',\n route: `update:${destination.alias}`,\n destinationCalendarId: destination.calendarId,\n sourceKey: desired.sourceKey,\n destinationEventId: destinationEvent.id,\n body,\n });\n }\n }\n\n for (const [sourceKey, destinationEvent] of destinationByKey) {\n if (!matchedDestinationIds.has(destinationEvent.id)) {\n actions.push({\n action: 'delete',\n route: `delete:${destination.alias}`,\n destinationCalendarId: destination.calendarId,\n sourceKey,\n destinationEventId: destinationEvent.id,\n reason: 'source event no longer exists or no longer overlaps the work window',\n });\n }\n }\n\n for (const destinationEvent of duplicateDestinations) {\n actions.push({\n action: 'delete',\n route: `delete:${destination.alias}`,\n destinationCalendarId: destination.calendarId,\n sourceKey: parseMarker(destinationEvent)?.sourceKey,\n destinationEventId: destinationEvent.id,\n reason: 'duplicate destination event for source mapping',\n });\n }\n}\n\nreturn actions.slice(0, MAX_ACTIONS_PER_RUN).map(action => ({ json: action }));\n" }, "position": [ 240, 0 ], "type": "n8n-nodes-base.code", "typeVersion": 2 }, { "name": "Route Action", "parameters": { "options": {}, "rules": { "values": [ { "conditions": { "combinator": "and", "conditions": [ { "leftValue": "={{ $json.route }}", "operator": { "name": "filter.operator.equals", "operation": "equals", "type": "string" }, "rightValue": "create:Work Calendar A" } ], "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict", "version": 2 } }, "outputKey": "Create Work Calendar A", "renameOutput": true }, { "conditions": { "combinator": "and", "conditions": [ { "leftValue": "={{ $json.route }}", "operator": { "name": "filter.operator.equals", "operation": "equals", "type": "string" }, "rightValue": "update:Work Calendar A" } ], "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict", "version": 2 } }, "outputKey": "Update Work Calendar A", "renameOutput": true }, { "conditions": { "combinator": "and", "conditions": [ { "leftValue": "={{ $json.route }}", "operator": { "name": "filter.operator.equals", "operation": "equals", "type": "string" }, "rightValue": "delete:Work Calendar A" } ], "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict", "version": 2 } }, "outputKey": "Delete Work Calendar A", "renameOutput": true }, { "conditions": { "combinator": "and", "conditions": [ { "leftValue": "={{ $json.route }}", "operator": { "name": "filter.operator.equals", "operation": "equals", "type": "string" }, "rightValue": "create:Work Calendar B" } ], "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict", "version": 2 } }, "outputKey": "Create Work Calendar B", "renameOutput": true }, { "conditions": { "combinator": "and", "conditions": [ { "leftValue": "={{ $json.route }}", "operator": { "name": "filter.operator.equals", "operation": "equals", "type": "string" }, "rightValue": "update:Work Calendar B" } ], "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict", "version": 2 } }, "outputKey": "Update Work Calendar B", "renameOutput": true }, { "conditions": { "combinator": "and", "conditions": [ { "leftValue": "={{ $json.route }}", "operator": { "name": "filter.operator.equals", "operation": "equals", "type": "string" }, "rightValue": "delete:Work Calendar B" } ], "options": { "caseSensitive": true, "leftValue": "", "typeValidation": "strict", "version": 2 } }, "outputKey": "Delete Work Calendar B", "renameOutput": true } ] } }, "position": [ 480, 0 ], "type": "n8n-nodes-base.switch", "typeVersion": 3.4 }, { "name": "Create Work Calendar A Block", "parameters": { "authentication": "predefinedCredentialType", "jsonBody": "={{ $json.body }}", "method": "POST", "nodeCredentialType": "REDACTED", "options": {}, "sendBody": true, "specifyBody": "json", "url": "https://example.invalid/redacted" }, "position": [ 736, -400 ], "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.3 }, { "name": "Update Work Calendar A Block", "parameters": { "authentication": "predefinedCredentialType", "jsonBody": "={{ $json.body }}", "method": "PATCH", "nodeCredentialType": "REDACTED", "options": {}, "sendBody": true, "specifyBody": "json", "url": "https://example.invalid/redacted" }, "position": [ 736, -240 ], "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.3 }, { "name": "Delete Work Calendar A Block", "parameters": { "authentication": "predefinedCredentialType", "method": "DELETE", "nodeCredentialType": "REDACTED", "options": {}, "url": "https://example.invalid/redacted" }, "position": [ 736, -80 ], "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.3 }, { "name": "Create Work Calendar B Block", "parameters": { "authentication": "predefinedCredentialType", "jsonBody": "={{ $json.body }}", "method": "POST", "nodeCredentialType": "REDACTED", "options": {}, "sendBody": true, "specifyBody": "json", "url": "https://example.invalid/redacted" }, "position": [ 736, 96 ], "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.3 }, { "name": "Update Work Calendar B Block", "parameters": { "authentication": "predefinedCredentialType", "jsonBody": "={{ $json.body }}", "method": "PATCH", "nodeCredentialType": "REDACTED", "options": {}, "sendBody": true, "specifyBody": "json", "url": "https://example.invalid/redacted" }, "position": [ 736, 256 ], "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.3 }, { "name": "Delete Work Calendar B Block", "parameters": { "authentication": "predefinedCredentialType", "method": "DELETE", "nodeCredentialType": "REDACTED", "options": {}, "url": "https://example.invalid/redacted" }, "position": [ 736, 416 ], "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.3 } ], "settings": { "binaryMode": "separate", "executionOrder": "v1" }, "tags": [ { "createdAt": "2026-04-06T17:02:21.457Z", "name": "managed-as-code", "updatedAt": "2026-04-06T17:02:21.457Z" }, { "createdAt": "2025-12-09T17:27:40.765Z", "name": "Personal", "updatedAt": "2025-12-09T17:27:40.765Z" } ] }