I made a reminder bot for slack, where you can make reminders for yourself. If you want to test out the bot, you must first authorize the reminder bot to a workspace (eg. Hack Club). The commands you can use are:
/rremindme
/rreminders <user (optional)>
/rremovereminder
If you use the /rremindme command, it will remind you in the same channel where you ran the command. If its a private joinable channel, you must invite the bot first so it can send messages on its own.