convert string to cento seconds (second / 100) and back

Google Apps Script

function csecs_from_str(str) {
  var arr = [{}];
  var str1 = str + ""
  arr = str1.split(":")
  if (arr.length > 1) {
    var min = parseInt(arr[0])
    var sec = parseFloat(arr[1])
    return ((min * 60.0) + sec) * 100
  }
  else {
    var sec = parseFloat(arr[0])
    return sec * 100
  }
}

function str_from_csec(s) {
 // Pad to 2 or 3 digits, default is 2
  function pad(n, z) {
    z = z || 2;
    return ('00' + n).slice(-z);
  }

  var ms = s % 100;
  s = (s - ms) / 100;
  var secs = s % 60;
  s = (s - secs) / 60;
  var mins = s % 60;
    return pad(mins) + ':' + pad(secs) + '.' + pad(ms, 2);
  }

// created by Tzach
// source: https://stackoverflow.com/questions/9763441/milliseconds-to-time-in-javascript

// Examples
// Logger.log(csecs_from_str("22.93"))
// Logger.log(csecs_from_str("01:22.93"))