docs: def get_timestats_str(unixtime_list, newlines=1, full=True, isutc=True):
      r"""
      Args:
          unixtime_list (list):
          newlines (bool):
  
      Returns:
          str: timestat_str
  
      CommandLine:
          python -m utool.util_time --test-get_timestats_str
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_time import *  # NOQA
          >>> import utool as ut
          >>> unixtime_list = [0, 0 + 60 * 60 * 5 , 10 + 60 * 60 * 5, 100 + 60 * 60 * 5, 1000 + 60 * 60 * 5]
          >>> newlines = 1
          >>> full = False
          >>> timestat_str = get_timestats_str(unixtime_list, newlines, full=full, isutc=True)
          >>> result = ut.align(str(timestat_str), ':')
          >>> print(result)
          {
              'max'  : '1970/01/01 05:16:40',
              'mean' : '1970/01/01 04:03:42',
              'min'  : '1970/01/01 00:00:00',
              'range': '5:16:40',
              'std'  : '2:02:01',
          }
  
      Example2:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_time import *  # NOQA
          >>> import utool as ut
          >>> unixtime_list = [0, 0 + 60 * 60 * 5 , 10 + 60 * 60 * 5, 100 + 60 * 60 * 5, 1000 + 60 * 60 * 5, float('nan'), 0]
          >>> newlines = 1
          >>> timestat_str = get_timestats_str(unixtime_list, newlines, isutc=True)
          >>> result = ut.align(str(timestat_str), ':')
          >>> print(result)
          {
              'max'    : '1970/01/01 05:16:40',
              'mean'   : '1970/01/01 03:23:05',
              'min'    : '1970/01/01 00:00:00',
              'nMax'   : 1,
              'nMin'   : 2,
              'num_nan': 1,
              'range'  : '5:16:40',
              'shape'  : (7,),
              'std'    : '2:23:43',
          }
  
      """
      import utool as ut
      datetime_stats = get_timestats_dict(unixtime_list, full=full, isutc=isutc)
      timestat_str = ut.repr4(datetime_stats, newlines=newlines)
      return timestat_str