How to pass data destined to console to a char array in Arduino

In a sketch that uses RTC on Arduino I have the following pieces of code:

// print time to Serial
void printTime(time_t t){
  printI00(hour(t), ':');
  printI00(minute(t), ':');
  printI00(second(t), ' ');

// print date to Serial
void printDate(time_t t){
  printI00(day(t), 0);
  Serial << monthShortStr(month(t)) << _DEC(year(t));

And with this print the RTC reading on the console:

void printDateTime(time_t t) {
  Serial << ' ';

How can I do so that I send to the console is also stored in a char array?

char bufferMSGtoClient[100];