HP EliteBook 2740p Tablet-PC - Manual (Page 66)

In the Windows fn+esc display, the version of the system BIOS (basic input-output system) is
displayed as the BIOS date. On some computer models, the BIOS date is displayed in decimal
format. The BIOS date is sometimes called the system ROM version number.
54 Chapter 4 Pointing devices, touch screen, and keyboard