docs: def get_timestamp(format_='iso', use_second=False, delta_seconds=None,
                    isutc=False, timezone=False):
      """
      get_timestamp
  
      Args:
          format_ (str): (tag, printable, filename, other)
          use_second (bool):
          delta_seconds (None):
  
      Returns:
          str: stamp
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_time import *  # NOQA
          >>> format_ = 'printable'
          >>> use_second = False
          >>> delta_seconds = None
          >>> stamp = get_timestamp(format_, use_second, delta_seconds)
          >>> print(stamp)
          >>> assert len(stamp) == len('15:43:04 2015/02/24')
      """
      # TODO: time.timezone
      if format_ == 'int':
          if isutc:
              stamp = int(time.mktime(time.gmtime()))
          else:
              stamp = int(time.mktime(time.localtime()))
          return stamp
      if isutc:
          now = datetime.datetime.utcnow()
      else:
          now = datetime.datetime.now()
      if delta_seconds is not None:
          now += datetime.timedelta(seconds=delta_seconds)
      if format_ == 'iso':
          # ISO 8601
          #utcnow = datetime.datetime.utcnow()
          #utcnow.isoformat()
          localOffsetHour = time.timezone // 3600
          utc_offset = '-' + str(localOffsetHour) if localOffsetHour < 0 else '+' + str(localOffsetHour)
          stamp = time.strftime('%Y-%m-%dT%H%M%S') + utc_offset
          return stamp
      if format_ == 'tag':
          time_tup = (now.year - 2000, now.month, now.day)
          stamp = '%02d%02d%02d' % time_tup
      elif format_ == 'printable':
          time_tup = (now.hour, now.minute, now.second, now.year, now.month, now.day)
          time_format = '%02d:%02d:%02d %02d/%02d/%02d'
          stamp = time_format % time_tup
      else:
          if use_second:
              time_tup = (now.year, now.month, now.day, now.hour, now.minute, now.second)
              time_formats = {
                  'filename': 'ymd_hms-%04d-%02d-%02d_%02d-%02d-%02d',
                  'comment': '# (yyyy-mm-dd hh:mm:ss) %04d-%02d-%02d %02d:%02d:%02d'}
          else:
              time_tup = (now.year, now.month, now.day, now.hour, now.minute)
              time_formats = {
                  'filename': 'ymd_hm-%04d-%02d-%02d_%02d-%02d',
                  'comment': '# (yyyy-mm-dd hh:mm) %04d-%02d-%02d %02d:%02d'}
          stamp = time_formats[format_] % time_tup
      if timezone:
          if isutc:
              stamp += '_UTC'
          else:
              from pytz import reference
              localtime = reference.LocalTimezone()
              tzname = localtime.tzname(now)
              stamp += '_' + tzname
      return stamp