js-dicom/src/dicomParser/util/parseTM.js

this is js-dicom

/**
 * Parses a TM formatted string into a javascript object with properties for hours, minutes, seconds and fractionalSeconds
 * @param {string} time - a string in the TM VR format
 * @param {boolean} [validate] - true if an exception should be thrown if the date is invalid
 * @returns {*} javascript object with properties for hours, minutes, seconds and fractionalSeconds or undefined if no element or data.  Missing fields are set to undefined
 */
export default function parseTM (time, validate) {
  if (time.length >= 2) // must at least have HH
  {
    // 0123456789
    // HHMMSS.FFFFFF
    var hh = parseInt(time.substring(0, 2), 10);
    var mm = time.length >= 4 ? parseInt(time.substring(2, 4), 10) : undefined;
    var ss = time.length >= 6 ? parseInt(time.substring(4, 6), 10) : undefined;
    var ffffff = time.length >= 8 ? parseInt(time.substring(7, 13), 10) : undefined;

    if (validate) {
      if ((isNaN(hh)) ||
        (mm !== undefined && isNaN(mm)) ||
        (ss !== undefined && isNaN(ss)) ||
        (ffffff !== undefined && isNaN(ffffff)) ||
        (hh < 0 || hh > 23) ||
        (mm && (mm < 0 || mm > 59)) ||
        (ss && (ss < 0 || ss > 59)) ||
        (ffffff && (ffffff < 0 || ffffff > 999999))) {
        throw `invalid TM '${time}'`;
      }
    }

    return {
      hours: hh,
      minutes: mm,
      seconds: ss,
      fractionalSeconds: ffffff
    };
  }

  if (validate) {
    throw `invalid TM '${time}'`;
  }

  return undefined;
}