The reference date-time of reference time units.
See also
calendar, isreftime, units
>>> repr(Units('days since 1900-1-1').reftime) <CF Datetime: 1900-01-01 00:00:00> >>> str(Units('days since 1900-1-1 03:00').reftime) '1900-01-01 03:00:00'
cf.Units.istime
cf.Units.units
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