I tried both of the following:
{% ToShortDateString(CurrentDateTime) %}
{% ToShortDateString(Date) %}
And had the same problem: "ToShortDateString(Date)" & "ToShortDateString(CurrentDateTime)"
Interestingly, the following code does work:
{% "Date: " + GetDateTime(Date, "d") + " additional statement" %}
Outputs: "Date: 04/01/2015 additional statement"
But this code does not work, and I need to add this into an 'if' statement, so it can't be stated on its own:
{% if (Period == "1 Day") {"Date: " + GetDateTime(Date, "d") + " additional statement"} |(identity)GlobalAdministrator%}