HP 54710A User's Reference Manual page 107

Channel Menu
Calibrate
Cal status
Pressing the Cal status (calibration status) softkey displays a screen similar
to figure 6-2.
Current Date This is the current date and time. You can compare this
to the last best accuracy calibration time or the last plug-in calibration
time. That way you will know how long it has been since the last best
accuracy calibration or normal plug-in calibration was performed.
Figure 6-2
6–12