docs: def check_time(self, dataset):
          '''
          double time(time) ;//........................................ Depending on the precision used for the variable, the data type could be int or double instead of float.
              time:long_name = "" ; //..................................... RECOMMENDED - Provide a descriptive, long name for this variable.
              time:standard_name = "time" ; //............................. REQUIRED    - Do not change
              time:units = "seconds since 1970-01-01 00:00:00 0:00" ; //... REQUIRED    - Use approved CF convention with approved UDUNITS.
              time:calendar = "julian" ; //................................ REQUIRED    - IF the calendar is not default calendar, which is "gregorian".
              time:axis = "T" ; //......................................... REQUIRED    - Do not change.
              time:_FillValue = 0.0f;//.................................... REQUIRED  if there could be missing values in the data.
              time:ancillary_variables = "" ; //........................... RECOMMENDED - List other variables providing information about this variable.
              time:comment = "" ; //....................................... RECOMMENDED - Add useful, additional information here.
          '''
          results = []
          time_var = util.get_time_variable(dataset)
          if not time_var:
              return Result(BaseCheck.HIGH, False, 'Coordinate variable time', ['Time coordinate variable was not found'])
          required_ctx = TestCtx(BaseCheck.HIGH, 'Required attributes for variable time')
          required_ctx.assert_true(getattr(dataset.variables[time_var], 'standard_name', '') == 'time', 'standard_name is "time"')
          time_regex = r'(seconds|minutes|hours|days) since.*'
          time_units = getattr(dataset.variables[time_var], 'units', '')
          required_ctx.assert_true(re.match(time_regex, time_units) is not None, 'Valid units for time')
          calendar = getattr(dataset.variables[time_var], 'calendar', '')
          valid_calendars = [
              'standard',
              'gregorian',
              'proleptic_gregorian',
              'noleap',
              '365_day',
              '360_day',
              'julian',
              'all_leap',
              '366_day'
          ]
  
          if calendar:
              required_ctx.assert_true(calendar.lower() in valid_calendars, 'calendar attribute should be a valid calendar in ({})'.format(', '.join(valid_calendars)))
  
          results.append(required_ctx.to_result())
          recommended_ctx = TestCtx(BaseCheck.MEDIUM, 'Recommended attributes for variable time')
          recommended_ctx.assert_true(getattr(dataset.variables[time_var], 'long_name', '') != '', 'long_name attribute should exist and not be empty')
          if hasattr(dataset.variables[time_var], 'comment'):
              recommended_ctx.assert_true(getattr(dataset.variables[time_var], 'comment', '') != '', 'comment attribute should not be empty if specified')
          results.append(recommended_ctx.to_result())
  
          return results