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72 lines
2.4 KiB
C++
72 lines
2.4 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.
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// TimeChangeRules can be hard-coded or read from EEPROM, see comments.
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// Jack Christensen Mar 2012
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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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setTime(myTZ.toUTC(compileTime()));
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//setTime(01, 55, 00, 11, 3, 2012); //another way to set the time (hr,min,sec,day,mnth,yr)
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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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// Function to return the compile date and time as a time_t value
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time_t compileTime()
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{
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const time_t FUDGE(10); // fudge factor to allow for compile time (seconds, YMMV)
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const char *compDate = __DATE__, *compTime = __TIME__, *months = "JanFebMarAprMayJunJulAugSepOctNovDec";
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char chMon[3], *m;
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tmElements_t tm;
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strncpy(chMon, compDate, 3);
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chMon[3] = '\0';
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m = strstr(months, chMon);
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tm.Month = ((m - months) / 3 + 1);
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tm.Day = atoi(compDate + 4);
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tm.Year = atoi(compDate + 7) - 1970;
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tm.Hour = atoi(compTime);
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tm.Minute = atoi(compTime + 3);
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tm.Second = atoi(compTime + 6);
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time_t t = makeTime(tm);
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return t + FUDGE; // add fudge factor to allow for compile time
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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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