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54 lines
2.3 KiB
C++
54 lines
2.3 KiB
C++
/*----------------------------------------------------------------------*
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* Arduino Timezone Library *
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* Jack Christensen Mar 2012 *
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* *
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* 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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#ifndef TIMEZONE_H_INCLUDED
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#define TIMEZONE_H_INCLUDED
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#include <Arduino.h>
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#include <TimeLib.h>
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// convenient constants for TimeChangeRules
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enum week_t { Last, First, Second, Third, Fourth };
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enum dow_t { Sun = 1, Mon, Tue, Wed, Thu, Fri, Sat };
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enum month_t { Jan = 1, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec };
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// structure to describe rules for when daylight/summer time begins,
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// or when standard time begins.
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struct TimeChangeRule {
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char abbrev[6]; // five chars max
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uint8_t week; // First, Second, Third, Fourth, or Last week of the month
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uint8_t dow; // day of week, 1=Sun, 2=Mon, ... 7=Sat
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uint8_t month; // 1=Jan, 2=Feb, ... 12=Dec
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uint8_t hour; // 0-23
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int offset; // offset from UTC in minutes
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};
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class Timezone {
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public:
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Timezone(TimeChangeRule dstStart, TimeChangeRule stdStart);
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Timezone(TimeChangeRule stdTime);
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time_t toLocal(time_t utc);
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time_t toLocal(time_t utc, TimeChangeRule ** tcr);
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time_t toUTC(time_t local);
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bool utcIsDST(time_t utc);
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bool locIsDST(time_t local);
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void setRules(TimeChangeRule dstStart, TimeChangeRule stdStart);
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private:
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void calcTimeChanges(int yr);
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void initTimeChanges();
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time_t toTime_t(TimeChangeRule r, int yr);
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TimeChangeRule m_dst; // rule for start of dst or summer time for any year
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TimeChangeRule m_std; // rule for start of standard time for any year
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time_t m_dstUTC; // dst start for given/current year, given in UTC
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time_t m_stdUTC; // std time start for given/current year, given in UTC
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time_t m_dstLoc; // dst start for given/current year, given in local time
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time_t m_stdLoc; // std time start for given/current year, given in local time
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};
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#endif
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