Calculate time since (Needs GPS).ino

#include <TinyGPS++.h>                      // For gps
#include <SoftwareSerial.h>                 // For communicating with the gps

struct dateTime {                         // Stores date and time for DateTime calculations
  int Year;
  int Month;
  int Date;
};

dateTime current;
dateTime past;
dateTime timeElapsed;

void timeSince()
{

#ifdef SERIALECHO
  char Date[50];
  sprintf(Date, "The current date is: %d/%d/%d", current.Date, current.Month, current.Year);
  Serial.println(Date);
  sprintf(Date, "The previous date is: %d/%d/%d", past.Date, past.Month, past.Year);
  Serial.println(Date);
#endif
  //Calculate years passed
  timeElapsed.Year = current.Year - past.Year;

  //Calculate the months passed and correct the number of years if required
  if (current.Month < past.Month) {
#ifdef SERIALECHO
    Serial.println(F("Current Month < Past Month"));
#endif
    timeElapsed.Year -= 1;
    timeElapsed.Month = 12 - (abs(current.Month - past.Month));
  }
  else
    timeElapsed.Month = (current.Month - past.Month);

  //Calculate the days passed and correct the number of months
  if (current.Date < past.Date) {
#ifdef SERIALECHO
    Serial.println(F("Current Date < Past Date"));
#endif
    timeElapsed.Month -= 1;
    timeElapsed.Date = (calcNoOfDays(months, years)) - (abs(current.Date - past.Date));
  }
  else
    timeElapsed.Date = (current.Date - past.Date);
#ifdef SERIALECHO
  sprintf(Date, "The time elapsed is: %d days %d months %d years", timeElapsed.Date, timeElapsed.Month, timeElapsed.Year);
  Serial.println(Date);
#endif
}