This checks the current date and time (at the time the user will be using your application). Date Time Conditions have an optional duration field that allows for you to define a duration during which the Condition is true. When using this for that purpose duration should be selected as the operator.
Duration may be used in conjunction with the before and after operator, this allows for you to define things such as a Condition that is true after a certain time, but only within a specific window of time for that. Negative time duration may be used to indicate a time window before the date time.
The Date and Time for this Condition.
The time window during which this Condition will be true.
The time-window during which this Condition is true occurs: after, before, or during the selected DateTime.