I’m working with code from the Web Servers course  3.4 – Web Server: Display Sensor Readings from File (Charts).  I have converted it to store readings on an SD card and now wish to rename the resulting file with the week number and year. I can print out the week number but can’t find out how to assign it to a string, so that I can concatenate it with the year.  The code that prints the week number is below (see bold type), but I need to assign the (&timeinfo, “%V”) part to a string literal.

Any ideas?

 
// Function that gets current epoch time
unsigned long getTime() {
  time_t now;
 
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    Serial.println(“Failed to obtain time”);
    return(0);
  }
  time(&now);
  currentTime = (time(&now) + gmtOffset_sec + daylightOffset_sec);
  Serial.print(“Week No. = “);
  Serial.println(&timeinfo, “%V”);
  return currentTime;
}