Generate error message if todays date not picked.

Hi All

I have a userform with a DTpicker on it, I would like a warning message to appear if any other date has been picked except "Todays" date. Generally todays date is used but there are certain circumstances that another date may be entered so i dont want the code to stop as such, just a warning to say "are you sure you want another date".

Can anyone help me with the code on this

Thanks in advance.