Workflow: construct a n8n workflow for Datetime Googlecalendar Send Scheduled
Integrations: code, cron, dateTime, emailSend, googleCalendar, merge, noOp, set, switch

{"meta": {"instanceId": "8c8c5237b8e37b006a7adce87f4369350c58e41f3ca9de16196d3197f69eabcd"}, "nodes": [{"id": "6f869392-1501-49b9-be86-4b767f7ec597", "name": "Previous Month", "type": "n8n-nodes-base.dateTime", "position": [360, 420], "parameters": {"value": "={{Date()}}", "action": "calculate", "options": {}, "duration": 1, "timeUnit": "months", "operation": "subtract"}, "typeVersion": 1}, {"id": "1446eb44-bd1e-4dad-9ecc-c2a1e8cb2ca6", "name": "1st of Every month at 8am", "type": "n8n-nodes-base.cron", "position": [180, 420], "parameters": {"triggerTimes": {"item": [{"hour": 8, "mode": "everyMonth"}]}}, "typeVersion": 1}, {"id": "a044ac76-49d9-4046-b008-2b4adf6512b1", "name": "Check Summary for Illness or Holiday", "type": "n8n-nodes-base.switch", "position": [760, 420], "parameters": {"rules": {"rules": [{"value2": "Holiday", "operation": "contains"}, {"output": 1, "value2": "Illness", "operation": "contains"}]}, "value1": "={{$json[\"summary\"]}}", "dataType": "string"}, "typeVersion": 1}, {"id": "6b40beab-7938-4aaa-a8a8-7a1e364dc2de", "name": "Holiday", "type": "n8n-nodes-base.noOp", "position": [980, 220], "parameters": {}, "typeVersion": 1}, {"id": "b069f3ce-66d1-4f64-946b-f9fda27db46b", "name": "Illness", "type": "n8n-nodes-base.noOp", "position": [980, 400], "parameters": {}, "typeVersion": 1}, {"id": "5725626b-2bfd-47a0-947e-efd28f0c29fe", "name": "Filter Holiday Days", "type": "n8n-nodes-base.set", "position": [1180, 220], "parameters": {"values": {"string": [{"name": "Name", "value": "={{$json[\"description\"].split(\",\")[0]}}"}, {"name": "Days", "value": "={{(new Date($json[\"end\"][\"date\"]).getTime() - new Date($json[\"start\"][\"date\"]).getTime()) / (1000 * 3600 * 24)}}"}, {"name": "Type", "value": "Holiday"}]}, "options": {}, "keepOnlySet": true}, "typeVersion": 1}, {"id": "3114eb4f-a5be-452c-9729-b94d2904eb4b", "name": "Filter Illness Days", "type": "n8n-nodes-base.set", "position": [1180, 400], "parameters": {"values": {"string": [{"name": "Name", "value": "={{$json[\"description\"].split(\",\")[0]}}"}, {"name": "Days", "value": "={{(new Date($json[\"end\"][\"date\"]).getTime() - new Date($json[\"start\"][\"date\"]).getTime()) / (1000 * 3600 * 24)}}"}, {"name": "Type", "value": "Illness"}]}, "options": {}, "keepOnlySet": true}, "typeVersion": 1}, {"id": "04617849-c162-4af5-9634-ab8ffd925625", "name": "Merge", "type": "n8n-nodes-base.merge", "position": [1620, 320], "parameters": {}, "typeVersion": 1}, {"id": "daf227d9-938d-4110-9a47-5bf8bb661586", "name": "Get previous months events", "type": "n8n-nodes-base.googleCalendar", "position": [560, 420], "parameters": {"options": {"timeMax": "={{new Date().toISOString()}}", "timeMin": "={{$json[\"data\"]}}"}, "calendar": "[Select Cal]", "operation": "getAll", "returnAll": true}, "credentials": {"googleCalendarOAuth2Api": {"id": "50", "name": "Google Calendar account"}}, "typeVersion": 1}, {"id": "19ec862a-e71a-49f9-b799-26f73a410553", "name": "Send email to payroll", "type": "n8n-nodes-base.emailSend", "position": [1980, 320], "parameters": {"text": "={{$json[\"message\"]}}", "options": {}, "subject": "Absences from last month", "toEmail": "payroll-team@mydomain.tld", "fromEmail": "n8n@mydomain.tld"}, "credentials": {"smtp": {"id": "16", "name": "mailtrap"}}, "typeVersion": 1}, {"id": "5805b2e1-e723-4803-a7e0-8df5fd4cf84d", "name": "Combine Holiday Counts", "type": "n8n-nodes-base.code", "position": [1380, 220], "parameters": {"jsCode": "let names = $input.all().map(e => e.json.Name);\nlet unique_names = [...new Set(names)];\nlet results = [];\n\nfor (thisName of unique_names) {\n  let result = {\n    \"Name\": thisName,\n    \"Days\": 0,\n    \"Type\": \"Holiday\"\n  }\n\n  for (matching_item of $input.all().filter(e => e.json.Name === thisName)) {\n    result.Days += parseInt(matching_item.json.Days);\n  }\n  \n  results.push(result);\n}\n\nreturn results.map(e => { return {json: e} });"}, "typeVersion": 1}, {"id": "c30345ae-1a19-4453-a67b-eda71cb7326e", "name": "Combine Illness Counts", "type": "n8n-nodes-base.code", "position": [1380, 400], "parameters": {"jsCode": "let names = $input.all().map(e => e.json.Name);\nlet unique_names = [...new Set(names)];\nlet results = [];\n\nfor (thisName of unique_names) {\n  let result = {\n    \"Name\": thisName,\n    \"Days\": 0,\n    \"Type\": \"Illness\"\n  }\n\n  for (matching_item of $input.all().filter(e => e.json.Name === thisName)) {\n    result.Days += parseInt(matching_item.json.Days);\n  }\n  \n  results.push(result);\n}\n\nreturn results.map(e => { return {json: e} });"}, "typeVersion": 1}, {"id": "7bac2604-ca55-4300-a7a5-38fc96830ba6", "name": "Build the message to send", "type": "n8n-nodes-base.code", "position": [1800, 320], "parameters": {"jsCode": "let illnessMessage = \"\";\nlet holidayMessage = \"\";\nlet message = \"Here is a breakdown of absences for the last month.\\n\\n\";\n\n// Loop the input items\nfor (item of $input.all()) {\n  if (item.json.Type == \"Holiday\") {\n    holidayMessage += item.json.Name + \" had \" + item.json.Days + \" days\\n\";\n  }\n  if (item.json.Type == \"Illness\") {\n    illnessMessage += item.json.Name + \" had \" + item.json.Days + \" days\\n\";\n  }\n}\n\nif (holidayMessage != \"\") {\n  message += \"Holiday Events\\n\";\n  message += holidayMessage + \"\\n\";\n} else {\n  message += \"No Holiday Events\\n\";\n}\n\nif (illnessMessage != \"\") {\n  message += \"Illness Events\\n\";\n  message += illnessMessage;\n} else {\n  message += \"No Illness Events\\n\";\n}\n\n// Return our message\nreturn [{json: {message}}];"}, "typeVersion": 1}], "connections": {"Merge": {"main": [[{"node": "Build the message to send", "type": "main", "index": 0}]]}, "Holiday": {"main": [[{"node": "Filter Holiday Days", "type": "main", "index": 0}]]}, "Illness": {"main": [[{"node": "Filter Illness Days", "type": "main", "index": 0}]]}, "Previous Month": {"main": [[{"node": "Get previous months events", "type": "main", "index": 0}]]}, "Filter Holiday Days": {"main": [[{"node": "Combine Holiday Counts", "type": "main", "index": 0}]]}, "Filter Illness Days": {"main": [[{"node": "Combine Illness Counts", "type": "main", "index": 0}]]}, "Combine Holiday Counts": {"main": [[{"node": "Merge", "type": "main", "index": 0}]]}, "Combine Illness Counts": {"main": [[{"node": "Merge", "type": "main", "index": 1}]]}, "1st of Every month at 8am": {"main": [[{"node": "Previous Month", "type": "main", "index": 0}]]}, "Build the message to send": {"main": [[{"node": "Send email to payroll", "type": "main", "index": 0}]]}, "Get previous months events": {"main": [[{"node": "Check Summary for Illness or Holiday", "type": "main", "index": 0}]]}, "Check Summary for Illness or Holiday": {"main": [[{"node": "Holiday", "type": "main", "index": 0}], [{"node": "Illness", "type": "main", "index": 0}]]}}}