Task: Working with dates and times

n8n workflow:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[1140,780],"parameters":{},"typeVersion":1},{"name":"Note","type":"n8n-nodes-base.stickyNote","position":[1480,760],"parameters":{"width":560,"height":400,"content":"## 2. Advanced way: Using Expressions\nIn this `Set` node, we set dates using [Luxon expressions](https://docs.n8n.io/code-examples/expressions/luxon/) for the following formats:\n\nNow - `{{$now}}`\nCurrent time with seconds - `{{$now.toLocaleString(DateTime.TIME_WITH_SECONDS)}}`\nToday - `{{$today}}`\nTomorrow - `{{$today.plus({days: 1})}}`\nOne hour ago - `{{$now.minus({hours: 1})}}`\nWeekday name - `{{$today.weekdayLong}}`\n\n"},"typeVersion":1},{"name":"Note3","type":"n8n-nodes-base.stickyNote","position":[660,780],"parameters":{"width":420,"height":100,"content":"### Click the `Execute Workflow` button and double click on the nodes to see the input and output items."},"typeVersion":1},{"name":"12 Hours from now","type":"n8n-nodes-base.dateTime","position":[1520,580],"parameters":{"value":"={{$now}}","action":"calculate","options":{},"duration":12,"timeUnit":"hours"},"typeVersion":1},{"name":"Note1","type":"n8n-nodes-base.stickyNote","position":[1480,400],"parameters":{"width":560,"height":340,"content":"## 1. Simple Way: Using the Date & Time node\nThere are two actions available within the `Date & Time` node:\n1. Calculating a date - adding/substracting minutes,hours, days, etc.\n2. Formatting a date\n\n"},"typeVersion":1},{"name":"Note4","type":"n8n-nodes-base.stickyNote","position":[1980,860],"parameters":{"width":480,"height":320,"content":"### 2.1 Working with an existing time string\nAs items pass between nodes, n8n saves dates as ISO strings. This means that in order to work with the data as a date again, we need to convert it back using `DateTime.fromISO('yyyy-mm-dd')`\n. Once doing that, we are able to apply date and time function again such as : `{{DateTime.fromISO($json[\"Now\"]).toFormat('yyyy LLL dd')}}`"},"typeVersion":1},{"name":"Set times","type":"n8n-nodes-base.set","position":[1520,1020],"parameters":{"values":{"string":[{"name":"Now","value":"={{$now}}"},{"name":"Current time with seconds","value":"={{$now.toLocaleString(DateTime.TIME_WITH_SECONDS)}}"},{"name":"Today","value":"={{$today}}"},{"name":"Tomorrow","value":"={{$today.plus({days: 1})}}"},{"name":"One hour from now","value":"={{$now.minus({hours: 1})}}"},{"name":"Weekday","value":"={{$today.weekdayLong}}"}]},"options":{}},"typeVersion":1},{"name":"Edit times","type":"n8n-nodes-base.set","position":[2080,1020],"parameters":{"values":{"string":[{"name":"Current time","value":"={{DateTime.fromISO($json[\"Now\"])}}"},{"name":"Current time formatted","value":"={{DateTime.fromISO($json[\"Now\"]).toFormat('yyyy LLL dd')}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Format - MMMM DD YY","type":"n8n-nodes-base.dateTime","position":[1760,580],"parameters":{"value":"={{$now}}","options":{},"toFormat":"MMMM DD YYYY"},"typeVersion":1}],"connections":{"Set times":{"main":[[{"node":"Edit times","type":"main","index":0}]]},"12 Hours from now":{"main":[[{"node":"Format - MMMM DD YY","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Set times","type":"main","index":0},{"node":"12 Hours from now","type":"main","index":0}]]}}}