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86 lines
3.2 KiB
C++
86 lines
3.2 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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// Sketch to verify operation of Timezone library.
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// Jack Christensen 14Nov2018
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#include <Timezone.h> // https://github.com/JChristensen/Timezone
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#include <TimeLib.h> // https://github.com/PaulStoffregen/Time
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// New Zealand Time Zone
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TimeChangeRule nzSTD = {"NZST", First, Sun, Apr, 3, 720}; // UTC + 12 hours
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TimeChangeRule nzDST = {"NZDT", Last, Sun, Sep, 2, 780}; // UTC + 13 hours
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Timezone nz(nzDST, nzSTD);
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// US Eastern Time Zone (New York, Detroit)
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TimeChangeRule etDST = {"EDT", Second, Sun, Mar, 2, -240}; // Daylight time = UTC - 4 hours
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TimeChangeRule etSTD = {"EST", First, Sun, Nov, 2, -300}; // Standard time = UTC - 5 hours
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Timezone et(etDST, etSTD);
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void setup()
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{
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Serial.begin(115200);
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// New Zealand
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printTimes( 1, 4, 2018, nzSTD.hour, nzDST.offset, nz); // day, month, year, hour, offset, tz
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printTimes(30, 9, 2018, nzDST.hour, nzSTD.offset, nz);
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printTimes( 7, 4, 2019, nzSTD.hour, nzDST.offset, nz);
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printTimes(29, 9, 2019, nzDST.hour, nzSTD.offset, nz);
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printTimes( 5, 4, 2020, nzSTD.hour, nzDST.offset, nz);
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printTimes(27, 9, 2020, nzDST.hour, nzSTD.offset, nz);
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// US Eastern
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printTimes(11, 3, 2018, etDST.hour, etSTD.offset, et); // day, month, year, hour, offset, tz
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printTimes( 4, 11, 2018, etSTD.hour, etDST.offset, et);
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printTimes(10, 3, 2019, etDST.hour, etSTD.offset, et);
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printTimes( 3, 11, 2019, etSTD.hour, etDST.offset, et);
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printTimes( 8, 3, 2020, etDST.hour, etSTD.offset, et);
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printTimes( 1, 11, 2020, etSTD.hour, etDST.offset, et);
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}
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void loop() {}
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// print corresponding UTC and local times "n" seconds before and after the time change.
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// h is the hour to change the clock using the *current* time (i.e. before the change).
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// offset is the utc offset in minutes for the time *after* the change.
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void printTimes(uint8_t d, uint8_t m, int y, uint8_t h, int offset, Timezone tz)
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{
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const time_t n(3); // number of times to print before and after the time change
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tmElements_t tm;
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tm.Hour = h;
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tm.Minute = 0;
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tm.Second = 0;
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tm.Day = d;
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tm.Month = m;
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tm.Year = y - 1970; // offset from 1970
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time_t utc = makeTime(tm) - offset * SECS_PER_MIN - n;
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Serial.print(F("\n-------- "));
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Serial.print(monthShortStr(m));
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Serial.print('-');
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Serial.print(y);
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Serial.print(F(" time change --------\n"));
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for (uint16_t i=0; i<n*2; i++)
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{
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TimeChangeRule *tcr; // pointer to the time change rule, use to get TZ abbrev
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time_t local = tz.toLocal(utc, &tcr);
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printDateTime(utc, "UTC = ");
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printDateTime(local, tcr -> abbrev);
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Serial.println();
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++utc;
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}
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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.print(buf);
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}
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