56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
/*
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* TimeUtils.h
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*
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* Copyright 2017 Christopher B. Liebman
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*
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* Created on: Jun 7, 2017
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* Author: liebman
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*/
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#ifndef TIMEUTILS_H_
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#define TIMEUTILS_H_
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#include <Arduino.h>
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#include <time.h>
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typedef struct
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{
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int tz_offset; // seconds offset from UTC
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uint8_t month; // starting month that this takes effect.
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int8_t occurrence; // 2 is second occurrence of the given day, -1 is last
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uint8_t day_of_week; // 0 = Sunday
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uint8_t hour;
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int8_t day_offset; // +/- days (for Friday before last Sunday type)
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} TimeChange;
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class TimeUtils
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{
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public:
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static uint8_t parseSmallDuration(const char* value);
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static int parseOffset(const char* offset_string);
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static uint16_t parsePosition(const char* position_string);
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static uint8_t parseOccurrence(const char* occurrence_string);
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static uint8_t parseDayOfWeek(const char* dow_string);
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static uint8_t parseMonth(const char* month_string);
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static uint8_t parseHour(const char* hour_string);
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static time_t mktime(struct tm *tmbuf);
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static struct tm* gmtime_r(const time_t *timer, struct tm *tmbuf);
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static int computeUTCOffset(time_t now, int tz_offset, TimeChange* tc, int tc_count);
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static uint8_t findDOW(uint16_t y, uint8_t m, uint8_t d);
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static uint8_t findNthDate(uint16_t year, uint8_t month, uint8_t dow, uint8_t nthWeek);
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static uint8_t daysInMonth(uint16_t year, uint8_t month);
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static uint8_t findDateForWeek(uint16_t year, uint8_t month, uint8_t dow, int8_t nthWeek);
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};
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#endif /* TIMEUTILS_H_ */
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