Brother DCP-4020C - Manual (Page 97)

8 - 19 PRINTER DRIVER SETTINGS
Print Date & Time
When enabled the Print Date and Time feature will print the date
and time on your document from your computer’s system clock.
Click the Setting button to change the Date and Time format, and
the Position and Font. To include a background with the Date and
Time, select Opaque. When Opaque is selected, you can click on
the Colour button to change the colour of the Date and Time
background.
The Date and Time in the selection box shows the format that will
be printed. The actual Date and Time printed on your document
is automatically retrieved from the settings of your computer.