Zimmy

Allows you to plan your announcements in advance.
You can use websites like https://discohook.org/ to generate your message, and then it's as simple as entering a channel and a date.
Don't forget, that the channel you are sending a planned message to must have a webhook.

Setup:

• Administrator runs configure command and sets the #channel, where bot is operated, and the @role, which can operate the bot.
  • It is recommended to use automatic setup
• Only server administrators and users with specified @role can use the bot.
• Bot will ignore all messages from other channels, except for configure and help commands

Commands:

• !configure - command for initial bot setup and future settings tweaking if needed
• !help - list of available commands
• !help [command] - detailed info about command
• !send or !send - schedule a message
• !planned - show list of currently planned messages, with the ability to manage them

Don't forget to change timezone in bot's settings to match your local time!