typo:

    // A numeric string between 32 and 49 is assumed to be in the 2000s:
    console.log( new Date( "49" ) );
    // Result: Date Fri Jan 01 2049 00:00:00 GMT-0500 (Eastern Standard Time)

    // A numeric string between 33 and 99 is assumed to be in the 1900s:
    console.log( new Date( "99" ) );
    // Result: Date Fri Jan 01 1999 00:00:00 GMT-0500 (Eastern Standard Time)

the second interval should start at 50, not 33