cf.Units.isreftime

Units.isreftime

True if the units are reference time units, False otherwise.

Note that time units (such as 'days') are not reference time units.

Examples:
>>> print Units('days since 2000-12-1 03:00').isreftime
True
>>> print Units('hours since 2100-1-1', calendar='noleap').isreftime
True
>>> print Units(calendar='360_day').isreftime
True
>>> print Units('days').isreftime
False
>>> print Units('kg').isreftime
False
>>> print Units().isreftime
False