code: function prepareTime(format, loc, iso) {
      var timeSuffixMapping = {'h':0,'m':1,'s':2}, add;
      loc = loc || English;
      return format.replace(/{([a-z])}/g, function(full, token) {
        var separators = [],
            isHours = token === 'h',
            tokenIsRequired = isHours && !iso;
        if(token === 't') {
          return loc['ampm'].join('|');
        } else {
          if(isHours) {
            separators.push(':');
          }
          if(add = loc['timeSuffixes'][timeSuffixMapping[token]]) {
            separators.push(add + '\\s*');
          }
          return separators.length === 0 ? '' : '(?:' + separators.join('|') + ')' + (tokenIsRequired ? '' : '?');
        }
      });
    }
docs: The ISO format allows times strung together without a demarcating ":", so make sure that these markers are now optional.