I ran into a peculiar problem that kept me busy for quite some time tonight

I added my Adafruit RTC DS1307 breakout (RTClib from Adafruit) to a project I'm working on and the when I tried to Serial.print the current time it outputted 165:165:85 instead of hh:mm:ss.

When I use the example sketch and upload it using Arduino 1.0.5 (I have a library that isn't compatible with the new Arduino IDE havent tried any versions in between yet) the sketch works fine but when I upload it using Visual Micro I get some errors:

Compiling 'test' for 'Arduino Mega 2560 or Mega ADK'

test.ino: In function void loop()
Error compiling project sources
Build failed for project 'test'

test.ino: 37: error: 'class DateTime' has no member named 'dayOfTheWeek

test.ino: 53: error: 'TimeSpan' was not declared in this scope 

the complete sketch:

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"

RTC_DS1307 rtc;

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

void setup () {
  while (!Serial); // for Leonardo/Micro/Zero

  Serial.begin(57600);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  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(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
}

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(daysOfTheWeek[now.dayOfTheWeek()]);
    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 midnight 1/1/1970 = ");
    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 + TimeSpan(7,12,30,6));
   
    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);
}
 

I do not need, and didn't use timespan and datetime in my original project so I didn't get any errors in VS. When I reduce the example sketch to:

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"

RTC_DS1307 rtc;

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

void setup() {
	while (!Serial); // for Leonardo/Micro/Zero

	Serial.begin(57600);
	if (!rtc.begin()) {
		Serial.println("Couldn't find RTC");
		while (1);
	}

	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(F(__DATE__), F(__TIME__)));
		// This line sets the RTC with an explicit date & time, for example to set
		// January 21, 2014 at 3am you would call:
		// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
	}
}

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(now.hour(), DEC);
	Serial.print(':');
	Serial.print(now.minute(), DEC);
	Serial.print(':');
	Serial.print(now.second(), DEC);
	Serial.println();

	delay(3000);
}
 

It compiles correctly but the output is completely different than the output when nuploaded using the Arduino IDE:

2165/165/165165:165:85 

versus

2017/2/111:49:8 

(I didn't set my RTC to the correct date / time yet)

I hope someone can explain why this difference occurs...

In the meanwhile I'll try to figure out what the highest Arduino IDE version is I can use with all my needed libraries

you've got mail....
by the way when I use Arduino 1.5.6 in Visual Micro the result is correct.