Re: My pet gripe is
Are you being serious? If you are, do you not realise that you can type whatever format you want into it, that's why it's called 'Custom'. The lists in the box are just suggestions and examples and custom ones you have already created for that workbook.
A condescending reply on a tech forum? That must be a first.
But anyway, another +1 here for the format the OP mentioned. I was surprised when they let me use it in a reporting function I made for an admin tool recently.