hello- I am trying to use the inline variable of either %Date% or %t% in an output name.

I am not using an iterator in this model, I simply want to be able to automat the output name to have the date included in the name.
I am getting the following messages (000354 if I use %date% and 000278 if I use %t%) , which could make sense if the model isn't actually recognizing the %.
- ERROR 000354: The name contains invalid characters
- ERROR 000278: Field mapping error: field type invalid for output field created_date and input field created_date
Do you have to be utilizing an iterator in your model in order to use the date inline variable?
Thanks in advance,
Vanessa