Date/Time Picker Default Value

It shows an error when I try to set manually the default value of Date/Time Picker action, as shown in the following image:

ALT

Actions panel opened. Date/Time Picker action is selected, and the default value is set manually to 9:00 AM.

When I set the default value to the variable Current Time, the error disappears. Image below:

ALT

Actions panel opened. Date/Time Picker action is selected, and the default value is set as the global property Current Time.

Am I doing something wrong?