ArduinoTestCode2

#include <U8g2lib.h>
#include <Wire.h>
#include <RTClib.h> // Installed from github .zip file
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#include <Adafruit_Si7021.h>

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme;
Adafruit_Si7021 si7021;

RTC_DS1307 rtc;

U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);


u8g2_uint_t offset;                     // current offset for the scrolling text
u8g2_uint_t width;                      // pixel width of the scrolling text (must be lesser than 128 unless U8G2_16BIT is defined
//const char *text = " - - - - - - - - ";        // scroll this text from right to left if upper line is scrolling
  const char *text1 = "----------------";        // scroll this text from right to left if upper line is still


char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};


void setup(void){

  Serial.begin(9600);
  u8g2.begin();
  delay(3000); // wait for console opening

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (!rtc.isrunning()) {
    Serial.println("RTC lost power, lets set the time!");

  // Comment out below lines once you set the date & time.
    // Following line sets the RTC to the date & time this sketch was compiled
    //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

    // Following line sets the RTC with an explicit date & time
    // for example to set January 27 2017 at 12:56 you would call:
     rtc.adjust(DateTime(2021, 6, 8, 12, 28, 0));
 }
   si7021.begin();

  if (!bme.begin(0x76)) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    u8g2.setCursor(34, 19);
    u8g2.print("Sensor Error!");

 }

width = u8g2.getUTF8Width(text1);      // calculate the pixel width of the text
//u8g2.setFontMode(0); // enable transparent mode, which is faster
u8g2_uint_t offset;

}

void loop(void) {

DateTime now = rtc.now();

                                                                                       //DAY
         u8g2.setFont(u8g2_font_pressstart2p_8f);
         u8g2.print(now.day(), DEC);

                                                                                      //MONTH
         u8g2.setFont(u8g2_font_pressstart2p_8f);
         u8g2.print(now.month(), DEC);

                                                                                      //YEAR
         u8g2.setFont(u8g2_font_pressstart2p_8f);
         u8g2.print(now.year(), DEC);


                                                                                     // HOURS
         u8g2.setFont(u8g2_font_pressstart2p_8f);
         u8g2.print(now.hour(), DEC);

                                                                                    // MINUTES
         u8g2.setFont(u8g2_font_pressstart2p_8f);
         u8g2.print(":");
         u8g2.print(now.minute(), DEC);

                                                                                    // SECONDS
         u8g2.setFont(u8g2_font_pressstart2p_8f);
         u8g2.print(":");
         u8g2.print(now.second(), DEC);

}