Example Scriptable script for creating an OmniFocus project with tasks that have dates relative to an nth weekday of the month date

Get OF Project For Next Meeting.js

// Variables used by Scriptable.
// These must be at the very top of the file. Do not edit.
// icon-color: brown; icon-glyph: apple-alt;
// share-sheet-inputs: file-url, url, plain-text;
let wom = 3
let dow = 4
var template = 
`- Coordinate «month» CocoaHeads meeting @parallel(true) @autodone(false)
	- Book a presenter @parallel(true) @autodone(false) @context(online) @tags(online) @due(«due» -2w 17:00) @defer(«due» -4w 00:00)
	- Create the Meetup & Tweet/Slack about it @parallel(true) @autodone(false) @due(«due» -2w 17:00) @defer(«due» -2w 00:00)
		shortcuts://x-callback-url/run-shortcut?name=Share%20CocoaHeads%20Meetup

	- Tweet/Slack 1 week before @parallel(true) @autodone(false) @due(«due» -1w 17:00) @defer(«due» -1w 00:00)
		shortcuts://x-callback-url/run-shortcut?name=Share%20CocoaHeads%20Meetup

	- Tweet/Slack 2 days before @parallel(true) @autodone(false) @due(«due» -2d 17:00) @defer(«due» -2d 00:00)
		shortcuts://x-callback-url/run-shortcut?name=Share%20CocoaHeads%20Meetup

	- Tweet/Slack 1 day before @parallel(true) @autodone(false) @due(«due» -1d 17:00) @defer(«due» -1d 00:00)
		shortcuts://x-callback-url/run-shortcut?name=Share%20CocoaHeads%20Meetup

	- Request CocoaHeads reimbursement  @parallel(true) @autodone(false) @due(«due» +1d 17:00) @defer(«due» +1d 00:00)
		shortcuts://x-callback-url/run-shortcut?name=CocoaHeads%20Reimbursement

	- Create next month’s project @parallel(true) @autodone(false) @due(«due» +1d 17:00) @defer(«due» +1d 00:00)
		shortcuts://x-callback-url/run-shortcut?name=CocoaHeads%20OmniFocus%20Project
`;

let month = nextMonth(new Date())
let monthName = month.toLocaleString('en-us', { month: 'long' });
let due = nthWeekdayOfMonth(dow, wom, month)
let dueString = due.getFullYear() + "-" + ("0" + (due.getMonth() + 1)).slice(-2) + "-" + ("0" + due.getDate()).slice(-2)

template = template.replace(new RegExp("«month»", 'g'), monthName)
template = template.replace(new RegExp("«due»", 'g'), dueString)

Pasteboard.copy(template)
Script.complete()

// Calculate nth day of month	
function nthWeekdayOfMonth(weekday, n, date) {
  var date = new Date(date.getFullYear(), date.getMonth(), 1),
      add = (weekday - date.getDay() + 7) % 7 + (n - 1) * 7;
  date.setDate(1 + add);
  return date;
}

// Get next month based on this month
function nextMonth(now) {
	var current = now
	
	if (now.getMonth() == 11) {
		current = new Date(now.getFullYear() + 1, 0, 1);
	} else {
		current = new Date(now.getFullYear(), now.getMonth() + 1, 1);
	}
	
	return current
}