WeMOS: D1 R1 mini LCD DS1307 I2C RTC

Library

https://github.com/Naguissa/uRTCLib

Code

#include "Arduino.h"
#include "uRTCLib.h"
// uRTCLib rtc;
uRTCLib rtc(0x68);
/*
 I2C LCD  ESP8266-Wenos D1 Mini
 GND          GND
 VCC          VIN
 SDA          D2
 SCL          D1
*/
#include <LiquidCrystal_I2C.h>

// set the LCD number of columns and rows
int lcdColumns = 16;
int lcdRows = 2;

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows); 

char cMonth[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
char DoW[7][10] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

void setup() {
  Serial.begin(9600);
  // delay(3000); // wait for console opening 

  URTCLIB_WIRE.begin();

  // Comment out below line once you set the date & time.
  // Following line sets the RTC with an explicit date & time
  // for example to set January 13 2022 at 12:56 you would call:
  // rtc.set(0, 56, 12, 5, 13, 1, 22);
  // rtc.set(second, minute, hour, dayOfWeek, dayOfMonth, month, year)
  // set day of week (1=Sunday, 7=Saturday)

  lcd.begin( 5, 4 );// initialize LCD
  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();
  lcd.clear(); 
}

void loop() {
  rtc.refresh();  

  lcd.setCursor(0,0);
  lcd.print( DoW[rtc.dayOfWeek()] );
  lcd.print(", ");
  lcd.print(rtc.day());
  lcd.print(' ');
  // lcd.print(rtc.month());
  lcd.print(cMonth[rtc.month()-1]);
  lcd.print(' ');
  lcd.print(2000+rtc.year()); 

  lcd.setCursor(4,1);
  print2digits(rtc.hour());
  lcd.print(':');
  print2digits(rtc.minute());
  lcd.print(':');
  print2digits(rtc.second());
     
  delay(1000);
}
 
void print2digits(int number) {
  if (number >= 0 && number < 10) {
    lcd.write('0');
  }
  lcd.print(number);
}