While trialing Obsidian I became fond of a core plugin it had called Daily notes. Activating the plugin adds a button in the interface that creates a new note with a name based on today's date. It makes keeping a daily log extremely easy.
Since I primarily use Simplenote I wanted the same thing on both iOS and macOS.
My DailyNote Shortcut on iOS
On macOS I was able to do this with a rather simple AppleScript that opens Simplenote, sends a keystroke of CMD+N, types in "Daily note:" followed by the current date. I've put the source of this script in a gist if you'd like it.
Saving this script as an application using Script Editor on Mac (I chose the name DailyNote), and then giving this app Accessibility permissions (System Preferences > Security & Privacy > Privacy > Accessibility > +) will allow you to run the app via Spotlight and then voila ... a new note in Simplenote with today's date in the title.
On iOS unfortunately Simplenote hasn't yet added many options to the Shortcuts library of commands so while I was able to create a quick "New Note" action on my phone I wasn't able to automate typing in the day's date. At least not exactly.
What I was able to do (see screenshot) is set a variable for today's date, copy it to the clipboard, open Simplenote, create a new note, and then I have to manually paste in today's Date. You can get the Shortcut here. Not ideal but good enough for now.