User access to the cursor-readout routine

Is it possible to call some user-code in the cursor-readour routine of the standard UI?
My x-coords are specified in minutes, but I would like the cursor-readout to display them as a date from a given origin.

You can set Axes.fmt_xdata to a callable that accepts the value and returns the string as you wish.

See also this example:


Perfect! Thank you very much.