Override Date, Time, Currency and Number Formats in ASP.NET Applications

I'm a software developer that enjoys a great many things. Developing and integrating with API's is one of them. I live on a smallholding in the beautiful KZN midlands in South Africa with my lovely wife, 2 dogs, some chickens, a few sheep, a cat with half a tail, and two feral children.
I may be the world's shoddiest example of an "IT guy": I love being outdoors, exercising, gardening, "farming" (I really cannot call myself a farmer - keeping some animals alive does not make one a farmer), riding motorbikes and generally doing things that I am far too old for.