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digistump-avr/libraries/TinyRTClib/examples/ds1307/ds1307.pde

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+// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
+
+#include <TinyWireM.h>
+#include "TinyRTClib.h"
+
+RTC_DS1307 RTC;
+
+void setup () {
+    Serial.begin(115200);
+    TinyWireM.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 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);
+}