Adding time do DS1307 by pressing a button

Projects Programming
1

So,I'm going to have 2 buttons,one will be increasing minutes by 1 and other one will be decreasing minutes by 1.But I'm not sure how to add 1 minute to time.Purpose of this will be to fix DS1307 time drift.

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib

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

RTC_DS1307 RTC;

void setup () {
   Serial.begin(57600);
   Wire.begin();
   RTC.begin();

 if (! RTC.isrunning()) {
   Serial.println("RTC is NOT running!");
   // following line sets the RTC to the date & time this sketch was compiled
   //RTC.adjust(DateTime(__DATE__, __TIME__));
 }

}

void loop () {
   DateTime now = RTC.now();

   Serial.print(now.year(), DEC);
   Serial.print('/');
   Serial.print(now.month(), DEC);
   Serial.print('/');
   Serial.print(now.day(), DEC);
   Serial.print(' ');
   Serial.print(now.hour(), DEC);
   Serial.print(':');
   Serial.print(now.minute(), DEC);
   Serial.print(':');
   Serial.print(now.second(), DEC);
   Serial.println();

   Serial.print(" since 1970 = ");
   Serial.print(now.unixtime());
   Serial.print("s = ");
   Serial.print(now.unixtime() / 86400L);
   Serial.println("d");

   // calculate a date which is 7 days and 30 seconds into the future
   DateTime future (now.unixtime() + 7 * 86400L + 30);

   Serial.print(" now + 7d + 30s: ");
   Serial.print(future.year(), DEC);
   Serial.print('/');
   Serial.print(future.month(), DEC);
   Serial.print('/');
   Serial.print(future.day(), DEC);
   Serial.print(' ');
   Serial.print(future.hour(), DEC);
   Serial.print(':');
   Serial.print(future.minute(), DEC);
   Serial.print(':');
   Serial.print(future.second(), DEC);
   Serial.println();

   Serial.println();
   delay(3000);
2

To adjust the time in to the RTC by 1 minute forwards, you may be able to so like this (untested):

RTC.adjust( RTC.now() + 60 ) ;