I’ve made an app that makes it possible to schedule a post in Lemmy at an arbitrary time. It’s available at https://schedule.lemmings.world and can be used by people from any instance.
Let me know what you think!
P.S. This post is made using the app!
Edit: And it’s open source!
I wouldn’t trust a website that wants your username and password.
Use a bot account to post if you are worried
I would if it was a bot instead of an obscure service that collects my credentials.