#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <time.h>
#include "RTClib.h"

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

uint32_t UTIL_GetBeginningOfWeekEpoch(DateTime now)
{
  uint32_t beginning_of_week_epoch = now.unixtime();
  beginning_of_week_epoch -= (uint32_t)now.second();
  beginning_of_week_epoch -= ((uint32_t)now.minute() * 60);
  beginning_of_week_epoch -= ((uint32_t)now.hour() * 60 * 60);
  beginning_of_week_epoch -= ((uint32_t)now.dayOfTheWeek() * 60 * 60 * 24);
  
  return beginning_of_week_epoch;
}

void setup ()
{
  Serial.begin(9600);

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

  if (! rtc.isrunning())
 {
   Serial.print("RTC is NOT running!");
   Serial.println();
 }
   rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
   //rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
}

void loop ()
{
   DateTime now = rtc.now();
   if(now.hour()<=9)
   {
     Serial.print("0");
     Serial.print(now.hour());
   }
   else {
    Serial.print(now.hour());
   }
   Serial.print(':');
   if(now.minute()<=9)
   {
     Serial.print("0");
     Serial.print(now.minute());
   }
   else {
    Serial.print(now.minute());
   }
   Serial.print(':');
   if(now.second()<=9)
   {
     Serial.print("0");
     Serial.print(now.second());
   }
   else {
    Serial.print(now.second());
   }
   Serial.println();

   Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
   Serial.print(",");
   if(now.day()<=9)
   {
     Serial.print("0");
     Serial.print(now.day());
   }
   else {
    Serial.print(now.day());
   }
   Serial.print('/');
   if(now.month()<=9)
   {
     Serial.print("0");
     Serial.print(now.month());
   }
   else {
    Serial.print(now.month());
   }
   Serial.print('/');
   if(now.year()<=9)
   {
     Serial.print("0");
     Serial.print(now.year());
   }
   else {
    Serial.print(now.year());
   } 
   Serial.println();

    uint32_t crt_week_epoch = UTIL_GetBeginningOfWeekEpoch(now); //Change to the beginning of the week
    Serial.print("Week begin: "); Serial.println(crt_week_epoch);
   delay(1000);
}