# cf.Units.istime

`Units.``istime`

  True if the units are time units, False otherwise.

  Note that reference time units (such as `'days since 2000-12-1'`) are not time units, nor are calendar years and calendar months.

  See also

  `iscalendartime`, `isdimensionless`, `islongitude`, `islatitude`, `ispressure`, `isreftime`

  Examples: |

      >>> Units('days').istime
      True
      >>> Units('seconds').istime
      True
      >>> Units('kg').istime
      False
      >>> Units().istime
      False
      >>> Units('hours since 2100-1-1', calendar='noleap').istime
      False
      >>> Units(calendar='360_day').istime
      False
      >>> Units('calendar_years').istime
      False
      >>> Units('calendar_months').istime
      False