text: import { addFormatToken } from "../format/format";
  import { addRegexToken, matchTimestamp, matchSigned } from "../parse/regex";
  import { addParseToken } from "../parse/token";
  import toInt from "../utils/to-int";
  
  // FORMATTING
  
  addFormatToken("X", 0, 0, "unix");
  addFormatToken("x", 0, 0, "valueOf");
  
  // PARSING
  
  addRegexToken("x", matchSigned);
  addRegexToken("X", matchTimestamp);
  addParseToken("X",
      function(input, array, config) {
          config._d = new Date(parseFloat(input, 10) * 1000);
      });
  addParseToken("x",
      function(input, array, config) {
          config._d = new Date(toInt(input));
      });