Date/Time Data Source

Actually, Date and Time are two separate data sources. We group them together here because they have similar properties.

With Date or Time data source, a label field gets current date or time value as input data at print time.

It is pretty streight forward to set up the Date or Time data sources.
First, select Date or Time option from the "Data Source" combo box. Then select a format option.
The Clock combobox lets you select clock type. Clock type can be either PC clock (PC's internal clock) or Printer's internal clock.

The Offset part needs more explanation. It is provided so that the final output value is the sum of clock and the Offset Date/Time Value. Here the Offset Date/Time Value is the value you put in in the Offset edit box, and the unit of Offset Date/Time Value can be set at Offset Unit combobox.