VB IsDate equivalent in C#

Now I'm living in a C# world... and my memory fails me every time I need to do this (which frankly, says worrying things about my memory)... DateTime.TryParse returns a boolean indicating whether the input string can be converted to a datetime or not. So you can write a wee function like the following:

public Boolean checkDate(string inputDate)
{
Boolean retValue = false;
DateTime outputDate;
if (DateTime.TryParse(inputDate, out outputDate))
{
retValue = true;
}
return retValue;
}