Task: Get today's date and day using the Function node

n8n workflow JSON:
{"id":"140","name":"Get today's date and day using the Function node","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Function","type":"n8n-nodes-base.function","position":[450,300],"parameters":{"functionCode":"var date = new Date().toISOString();\nvar day = new Date().getDay();\nconst weekday = [\"Sunday\", \"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\"];\n\nitems[0].json.date_today = date;\nitems[0].json.day_today = weekday[day];\n\nreturn items;"},"typeVersion":1}],"active":false,"settings":{},"connections":{"On clicking 'execute'":{"main":[[{"node":"Function","type":"main","index":0}]]}}}