Date Formats

These two links give details of the standard and custom date/time formats available in the .NET Framework and hence to a C# program:

http://msdn2.microsoft.com/en-us/library/az4se3k1(vs.80).aspx 

http://msdn2.microsoft.com/en-us/library/8kb3ddd4(vs.80).aspx 

The DateTime.Add(), and related methods, give you the same functionality as VB's DateAdd() function and the DateTime Subtraction operator, which yields a TimeSpan, can be used in place of DateDiff():

http://msdn2.microsoft.com/en-us/library/system.datetime_methods(vs.80).aspx  

It's also possible to call those functions directly from a C# program but, as this is not really recommended, I won't describe it here.