epoch2num and num2epoch are removed

These methods convert from unix timestamps to matplotlib floats, but are not used internally to Matplotlib, and should not be needed by end users. To convert a unix timestamp to datetime, simply use datetime.datetime.utcfromtimestamp, or to use NumPy datetime64 dt = np.datetime64(e*1e6, 'us').

Locator and Formatter wrapper methods

The set_view_interval, set_data_interval and set_bounds methods of Locators and Formatters (and their common base class, TickHelper) are removed. Directly manipulate the view and data intervals on the underlying axis instead.