I made this reference page for all the date and time formatting options in Siri Shortcuts. I never can remember what Short, Medium, Long, ISO 8601 etc mean. It’s a little more comprehensive than the Apple support page for the formats.
Hope you find it helpful.
For completeness, you may also want to incorporate the reference for the custom formatting is based on, or incorporate that bigger list of custom formatting options.
Thanks for the reference. I’ll probably keep it as is just for basic use as I don’t want it to become too convoluted.