Month Calendar : output selected range to MessageBox - pls explain

[VictorN]

So I tried this:

                    if(buf1 == buf2)
 ...

But it doesn't work - the logic is messed up somehow.

Of course it doesn't!
Because you compare the values of two pointers which are absolutely different!
You have to compare SYSTEMTIME objects (rng[0] and rng[1] in your case)