Saving files to SD card with time stamp form YYMMDDNN.TXT

Other Hardware Storage
1

Hi guys,

Maybe someone needs to save files to SD card with time stamp for a data logging. Using this topic I modified the code to compile on IDE 1.8.0 (Thank you fat16lib ).
The form for the time stamp is (for example) 17022805.TXT. Year:17, Month: 02, Day:28, Number of file: 05.

#include <SdFat.h>
SdFat sd;
SdFile file;

uint8_t const chipSelect = SS;

void fmt2d(char* str, uint8_t v) {
  if (v > 99) return;
  uint8_t n1 = v / 10;
  uint8_t n0 = v - 10 * n1;
  *str++ = '0' + n1;
  *str = '0' + n0;
}

bool openByDate(SdFile* file, uint8_t y, uint8_t m, uint8_t d) {
  char name[] = "YYMMDD00.TXT";
  fmt2d(name, y);
  fmt2d(name + 2, m);
  fmt2d(name + 4, d);
  for (uint8_t n = 0; n < 100; n++) {
    fmt2d(name + 6, n);
    if (file->open(name, O_CREAT | O_EXCL | O_WRITE)) return true;
  }

  return false;
}
void setup() {
  Serial.begin(9600);
  while (!Serial) {
    SysCall::yield();
  }
  Serial.println("type any character");
  while (Serial.available() == 0) {}

  if (!sd.begin(chipSelect)) {
    Serial.println("sd.begin failed");
  }
  if (openByDate(&file, 12, 3, 30)) {
    Serial.print("opened: ");
    file.printName();
    Serial.println();
  } else {
    Serial.println("open failed");
  }
  file.close();
  Serial.println("File Closed");
}
void loop() {}

Sorry for my English.