>In VFP, Sunday is the first day of the week, while it's Monday in .NET.
>Also, VFP's day numbers are one based while .NET's are zero based.
>Easy to handle once you know it, but it's not something I expected.

What did you expect, in products of two companies who never spoke with each other, couldn't agree on any standards, stole people from each other and then tried to erase any trace of the source of code which came with those people. Of course the default settings would be different. Anything else would be a hint.