- update to 1.6.0:
  * fix for masked array inputs
  * improved performance of the num2date algorithm, in some cases providing
    an over 100x speedup
  * fix for date2index for select != 'exact' when select='exact' works
  * silently change calendar='gregorian' to 'standard' internally, 
    since 'gregorian' deprecated in CF v1.9
  * add "is_leap_year" function
  * wheels that work on Apple M1 (arm64) available on pypi.
  * added support for "common_year" and "common_years" units for "noleap" 
    and "365_day" calendars
  * check consistency of year arg and has_year_zero kwarg in cftime.datetime
    (issue #248).  Also assume if has_year_zero not specified it should be True
    if year=0. Allow replace method to change has_year_zero. Issue UserWarning
    if year set to zero and calendar default is changed from False to True
    (so that user is aware the resulting instance will not be CF compliant).
  * '360_day' was missing from list of 'idealized' calendars.
  * fixed a bug that led to subclasses losing their type identity upon
    pickling
  * Change default behavior of proleptic_gregorian to has_year_zero=T
    (to be consistent with ISO-8601 since CF does not specify the year zero convention
    for this calendar). Issue warning when trying to
    to create a cftime.datetime instance that is not allowed in CF
  * clean-up deprecated calendar specific subclasses
  * added string formatting support to `cftime.datetime` objects
    (via `cftime.datetime.__format__`)
  * add support for astronomical year numbering (including year zero) for
    real-world calendars using 'has_year_zero' cftime.datetime kwarg
    Default is False for 'real-world' calendars ('julian', 'gregorian'/'standard', 
    'proleptic_gregorian'). Ignored for idealized calendars like '360_day

• Files Changed
• Browse Source