These two functions were deprecated in 3.3.0, and did not return an accurate Matplotlib datenum relative to the new Matplotlib epoch handling (~.dates.get_epoch and :rc:`date.epoch`). This version reverts the deprecation.

Now epoch2num and (undocumented) julian2num return floating point days since ~.dates.get_epoch as set by :rc:`date.epoch`, instead of floating point days since the old epoch of "0000-12-31T00:00:00". If needed, you can translate from the new to old values as old = new + mdates.date2num(np.datetime64('0000-12-31'))