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58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
// Arduino Timezone Library Copyright (C) 2018 by Jack Christensen and
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// licensed under GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html
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//
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// Arduino Timezone Library example sketch.
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// Self-adjusting clock for one time zone using an external real-time
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// clock, either a DS1307 or DS3231 (e.g. Chronodot).
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// Assumes the RTC is set to UTC.
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// TimeChangeRules can be hard-coded or read from EEPROM, see comments.
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// Check out the Chronodot at http://www.macetech.com/store/
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//
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// Jack Christensen Aug 2012
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#include <DS1307RTC.h> // https://github.com/PaulStoffregen/DS1307RTC
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#include <Timezone.h> // https://github.com/JChristensen/Timezone
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// US Eastern Time Zone (New York, Detroit)
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TimeChangeRule myDST = {"EDT", Second, Sun, Mar, 2, -240}; //Daylight time = UTC - 4 hours
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TimeChangeRule mySTD = {"EST", First, Sun, Nov, 2, -300}; //Standard time = UTC - 5 hours
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Timezone myTZ(myDST, mySTD);
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// If TimeChangeRules are already stored in EEPROM, comment out the three
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// lines above and uncomment the line below.
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//Timezone myTZ(100); //assumes rules stored at EEPROM address 100
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TimeChangeRule *tcr; //pointer to the time change rule, use to get TZ abbrev
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void setup()
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{
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Serial.begin(115200);
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setSyncProvider(RTC.get); // the function to get the time from the RTC
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if(timeStatus()!= timeSet)
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Serial.println("Unable to sync with the RTC");
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else
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Serial.println("RTC has set the system time");
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}
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void loop()
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{
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time_t utc = now();
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time_t local = myTZ.toLocal(utc, &tcr);
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Serial.println();
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printDateTime(utc, "UTC");
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printDateTime(local, tcr -> abbrev);
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delay(10000);
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}
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// format and print a time_t value, with a time zone appended.
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void printDateTime(time_t t, const char *tz)
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{
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char buf[32];
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char m[4]; // temporary storage for month string (DateStrings.cpp uses shared buffer)
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strcpy(m, monthShortStr(month(t)));
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sprintf(buf, "%.2d:%.2d:%.2d %s %.2d %s %d %s",
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hour(t), minute(t), second(t), dayShortStr(weekday(t)), day(t), m, year(t), tz);
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Serial.println(buf);
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}
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