Show alternative timesystems for the day

time_systems.js

function uint6ToB64 (nUint6) {
  // Taken from https://developer.mozilla.org/en-US/docs/Glossary/Base64
  return nUint6 < 26 ?
      nUint6 + 65
    : nUint6 < 52 ?
      nUint6 + 71
    : nUint6 < 62 ?
      nUint6 - 4
    : nUint6 === 62 ?
      43
    : nUint6 === 63 ?
      47
    :
      65;
}

function hmsInts() {
    hmsStr = new Date().toISOString().substr(11,8).split(':'); 
    return hmsStr.map((s) => parseInt(s))
}; 

function UTCTimeInHMS = () => {
  return new Date().toISOString().substr(11,8);
}

function UTCTimeInBase64() {
    result=''; 
    for (t of hmsInts()) {
        result += String.fromCharCode(uint6ToB64(t))
    }; 
    return result;
}

function UTCTimeInMillidays() {
    const hms = hmsInts(); 
    const dayFraction = hms[0]/24 + hms[1]/24/60 + hms[2]/24/60/60;
    return Math.round(1000000*dayFraction);
}

console.log(UTCTimeInHMS(), UTCTimeInBase64(), UTCTimeInMillidays())
// Example output is 00:45:51 Atz 31840
//   00:45:51 is UTC time 00:45:51
//   Atz is A/X t/8 z/8, where X88 are 24 60 60, so the max values for hours/minutes/seconds
//   31840 is 31840/1000000, so 31,480 parts of a day's 1,000,00