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LocalDateTime.cpp

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+/*
+  LocalDateTime.cpp
+
+  MIT License
+  Copyright (c) 2023 hdrlux
+*/
+
+#include <Arduino.h>  // for all the 'standard' Arduino stuff
+#include <Timezone_Generic.h>  // https://github.com/khoih-prog/Timezone_Generic [only this one, DO NOT install all dependencies !!]
+#include "LocalDateTime.h"
+
+/*** HowTo ****************************************************************
+  TimeChangeRule myRule = {abbrev, week, dow, month, hour, offset};
+  abbrev: is a character string abbreviation for the time zone, 
+   it must be no longer than five characters.
+  week: is the week of the month that the rule starts.
+  dow: is the day of the week that the rule starts.
+  hour: is the hour in local time that the rule starts (0-23).
+  offset: is the UTC offset in minutes for the time zone being defined.
+
+  For convenience, the following symbolic names can be used:
+  week: First, Second, Third, Fourth, Last
+  dow: Sun, Mon, Tue, Wed, Thu, Fri, Sat
+  month: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
+**************************************************************************/
+
+/*** Instruction ******************************************************************
+  Select ONE set of TimeChangeRules below, also for non DST zones
+  Selection NOT possible during runtime, only at compiletime
+  The timezones are defined by the offset, in minutes, from UTC. 
+  This means the start of a new minute, and the seconds, are timezone independent !
+**********************************************************************************/
+
+// Eastern US time zone [Ottawa, New York, Miami, Nassau]
+//TimeChangeRule mySTD = { "EST", First, Sun, Nov, 2, -300 };  // change to UTC - 5 hours
+//TimeChangeRule myDST = { "EDT", Second, Sun, Mar, 2, -240 }; // change to UTC - 4 hours
+
+// Western European Time Zone [London = GMT/BST, Dublin = GMT/IST, Lisboa = WET/WEST, Canarias]
+//TimeChangeRule mySTD = { "WET ", Last, Sun, Oct, 2, 0 };  // change to UTC
+//TimeChangeRule myDST = { "WEST", Last, Sun, Mar, 1, 60 }; // change to UTC + 1 hours
+
+// Central European Time Zone, directive 2000/84/EC [Bruxelles, Paris, Madrid, Roma, Beograd, Warszawa, Stockholm, Berlin]
+// All 3 European timezones change at the same time: 01:00 UTC
+TimeChangeRule mySTD = { "CET ", Last, Sun, Oct, 3, 60 };   // change to UTC + 1 hours
+TimeChangeRule myDST = { "CEST", Last, Sun, Mar, 2, 120 };  // change to UTC + 2 hours
+
+// Eastern European Time Zone [Helsinki, Rīga, Kyiv, Αθήνα]
+//TimeChangeRule mySTD = { "EET ", Last, Sun, Oct, 4, 120 }; // change to UTC + 2 hours
+//TimeChangeRule myDST = { "EEST", Last, Sun, Mar, 3, 180 }; // change to UTC + 3 hours
+
+// Australia Eastern Time Zone [Canberra, Brisbane, Sydney, Melbourne, Hobart]
+//TimeChangeRule mySTD = { "AEST", First, Sun, Apr, 3, 600 }; // change to UTC + 10 hours
+//TimeChangeRule myDST = { "AEDT", First, Sun, Oct, 2, 660 }; // change to UTC + 11 hours
+
+// Москва Standard Time (MSK, does not observe DST)
+//TimeChangeRule mySTD = {"MSK ", Last, Sun, Oct, 1, 180}; // allways UTC + 3 hours
+//TimeChangeRule myDST = {"MSK ", Last, Sun, Mar, 1, 180}; // allways UTC + 3 hours
+
+// Universal Time Coordinated [UTC]
+//TimeChangeRule mySTD = {"UTC ", Last, Sun, Oct, 1, 0};
+//TimeChangeRule myDST = {"UTC ", Last, Sun, Mar, 1, 0};
+
+Timezone* myTZ;
+
+void TZ_setup() {
+  myTZ = new Timezone(myDST, mySTD);
+}
+
+time_t TZ_Sec(time_t t) {  // convert UTC to Local-Time
+  TimeChangeRule* tcr;   // pointer to the time change rule, use to get TZ abbrev 
+  return (myTZ->toLocal(t, &tcr));
+}
+
+//End