hubot-at adds notification at specific time.
Add hubot-at to your package.json, run npm install and add hubot-at to external-scripts.json.
Add hubot-at to your package.json dependencies.
"dependencies": {
"hubot-at": ">= 0.0.1"
}
Add hubot-at to external-scripts.json.
> cat external-scripts.json
> ["hubot-at"]
kenjiskywalker> hubot at HH:MM foo
hubot> OK. I'll tell you "foo" at HH:MM
...
hubot> @kenjiskywalker It's HH:MM. Don't forget "foo"
reminder.coffeein hubot-scripts.- hubot-cron