# cf.CellMeasure.asreftime

`CellMeasure.``asreftime`(i=False)

  Convert the internal representation of data array elements to numeric reference times.

  Only applicable to cell measures with reference time units.

  If the calendar has not been set then the CF default calendar will be used and the units will be updated accordingly.

  See also

  `asdatetime`

  Examples 1: |

      >>> g = f.asreftime()

  Parameters: | i: `bool`, optional If True then update the cell measure in place. By default a new cell measure is created. In either case, a cell measure is returned.
  Returns: | out: `cf.CellMeasure`
  Examples 2: |

      >>> t.asdatetime().dtype
      dtype('O')
      >>> t.asreftime().dtype
      dtype('float64')