Initialisation

libraries/RTClib/examples/datecalc/datecalc.pde

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+// Simple date conversions and calculations
+
+#include <Wire.h>
+#include "RTClib.h"
+
+void showDate(const char* txt, const DateTime& dt) {
+    Serial.print(txt);
+    Serial.print(' ');
+    Serial.print(dt.year(), DEC);
+    Serial.print('/');
+    Serial.print(dt.month(), DEC);
+    Serial.print('/');
+    Serial.print(dt.day(), DEC);
+    Serial.print(' ');
+    Serial.print(dt.hour(), DEC);
+    Serial.print(':');
+    Serial.print(dt.minute(), DEC);
+    Serial.print(':');
+    Serial.print(dt.second(), DEC);
+    
+    Serial.print(" = ");
+    Serial.print(dt.unixtime());
+    Serial.print("s / ");
+    Serial.print(dt.unixtime() / 86400L);
+    Serial.print("d since 1970");
+    
+    Serial.println();
+}
+
+void setup () {
+    Serial.begin(57600);
+    
+    DateTime dt0 (0, 1, 1, 0, 0, 0);
+    showDate("dt0", dt0);
+
+    DateTime dt1 (1, 1, 1, 0, 0, 0);
+    showDate("dt1", dt1);
+
+    DateTime dt2 (2009, 1, 1, 0, 0, 0);
+    showDate("dt2", dt2);
+
+    DateTime dt3 (2009, 1, 2, 0, 0, 0);
+    showDate("dt3", dt3);
+
+    DateTime dt4 (2009, 1, 27, 0, 0, 0);
+    showDate("dt4", dt4);
+
+    DateTime dt5 (2009, 2, 27, 0, 0, 0);
+    showDate("dt5", dt5);
+
+    DateTime dt6 (2009, 12, 27, 0, 0, 0);
+    showDate("dt6", dt6);
+
+    DateTime dt7 (dt6.unixtime() + 3600); // one hour later
+    showDate("dt7", dt7);
+
+    DateTime dt8 (dt6.unixtime() + 86400L); // one day later
+    showDate("dt8", dt8);
+
+    DateTime dt9 (dt6.unixtime() + 7 * 86400L); // one week later
+    showDate("dt9", dt9);
+}
+
+void loop () {
+}

libraries/RTClib/examples/ds1307/ds1307.pde

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+// 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);
+#ifdef AVR
+  Wire.begin();
+#else
+  Wire1.begin(); // Shield I2C pins connect to alt I2C bus on Arduino Due
+#endif
+  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 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.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);
+}

libraries/RTClib/examples/softrtc/softrtc.pde

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+// Date and time functions using just software, based on millis() & timer
+
+#include <Wire.h>
+#include "RTClib.h"
+
+RTC_Millis rtc;
+
+void setup () {
+    Serial.begin(57600);
+    // following line sets the RTC to the date & time this sketch was compiled
+    rtc.begin(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(" seconds since 1970: ");
+    Serial.println(now.unixtime());
+    
+    // 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);
+}