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Timezone.h
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Timezone.h
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/*----------------------------------------------------------------------*
* Arduino Timezone Library v1.0 *
* Jack Christensen Mar 2012 *
* *
* This work is licensed under the Creative Commons Attribution- *
* ShareAlike 3.0 Unported License. To view a copy of this license, *
* visit http://creativecommons.org/licenses/by-sa/3.0/ or send a *
* letter to Creative Commons, 171 Second Street, Suite 300, *
* San Francisco, California, 94105, USA. *
*----------------------------------------------------------------------*/
#ifndef Timezone_h
#define Timezone_h
#if ARDUINO >= 100
#include <Arduino.h>
#else
#include <WProgram.h>
#endif
#include <Clock.h> // https://github.com/ddrown/Arduino_Clock
//convenient constants for dstRules
enum week_t {Last, First, Second, Third, Fourth};
enum dow_t {Sun=1, Mon, Tue, Wed, Thu, Fri, Sat};
enum month_t {Jan=1, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec};
//structure to describe rules for when daylight/summer time begins,
//or when standard time begins.
struct TimeChangeRule
{
char abbrev[6]; //five chars max
uint8_t week; //First, Second, Third, Fourth, or Last week of the month
uint8_t dow; //day of week, 1=Sun, 2=Mon, ... 7=Sat
uint8_t month; //1=Jan, 2=Feb, ... 12=Dec
uint8_t hour; //0-23
int offset; //offset from UTC in minutes
};
class Timezone
{
public:
Timezone(TimeChangeRule dstStart, TimeChangeRule stdStart);
Timezone(int address);
time_t toLocal(time_t utc);
time_t toLocal(time_t utc, TimeChangeRule **tcr);
time_t toUTC(time_t local);
boolean utcIsDST(time_t utc);
boolean locIsDST(time_t local);
void readRules(int address);
void writeRules(int address);
private:
void calcTimeChanges(int yr);
time_t toTime_t(TimeChangeRule r, int yr);
TimeChangeRule _dst; //rule for start of dst or summer time for any year
TimeChangeRule _std; //rule for start of standard time for any year
time_t _dstUTC; //dst start for given/current year, given in UTC
time_t _stdUTC; //std time start for given/current year, given in UTC
time_t _dstLoc; //dst start for given/current year, given in local time
time_t _stdLoc; //std time start for given/current year, given in local time
};
#endif