sclass BackupFileAge {
  // minutes (last group) are optional
  settable S pattern = "^(.*)\\.backup(2\\d\\d\\d)(\\d\\d)(\\d\\d)-(\\d\\d)(\\d*)$";
  
  settable S fileName;
  
  settable TimeZone timeZone = defaultTimeZone();
  settable long currentTime = now();
  
  S originalName;
  int year;
  int month;
  int day;
  int hour;
  int minute;
  long time;
  gettable double ageInDays;
  
  bool parse() {
    var pat = regexp(pattern);
    var matcher = pat.matcher(fileName);
    if (!matcher.find()) false;
    
    originalName = matcher.group(1);
    year = matcherInt(matcher, 2);
    month = matcherInt(matcher, 3);
    day = matcherInt(matcher, 4);
    hour = matcherInt(matcher, 5);
    minute = matcherInt(matcher, 6);
    time = timestampFromYMDHM(year, month, day, hour, minute, timeZone);
    ageInDays = ((currentTime-time)/1000.0/60/60/24;
    true;
  }
}