time.h

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#ifndef HARDWARE_AVR_TIME_H
#define HARDWARE_AVR_TIME_H

#include <stdint.h>
#include <string.h>

typedef uint32_t time_t;

struct tm {
  int8_t tm_sec;        
  int8_t tm_min;        
  int8_t tm_hour;       
  int8_t tm_mday;       
  int8_t tm_wday;       
  int8_t tm_mon;        
  int16_t tm_year;      
  int16_t tm_yday;      
  int16_t tm_isdst;     

  tm()
  {
    memset(this, 0, sizeof(tm));
  }

  tm(int8_t wday, int16_t year, int8_t mon, int8_t mday,
     int8_t hour, int8_t min, int8_t sec) :
    tm_sec(sec),
    tm_min(min),
    tm_hour(hour),
    tm_mday(mday),
    tm_wday(wday),
    tm_mon(mon),
    tm_year(year - 1900),
    tm_yday(0),
    tm_isdst(0)
  {
  }
} __attribute__((packed));

enum {
  SUNDAY,
  MONDAY,
  TUESDAY,
  WEDNESDAY,
  THURSDAY,
  FRIDAY,
  SATURDAY
};

enum {
  JANUARY,
  FEBRUARY,
  MARCH,
  APRIL,
  MAY,
  JUNE,
  JULY,
  AUGUST,
  SEPTEMBER,
  OCTOBER,
  NOVEMBER,
  DECEMBER
};

int32_t difftime(time_t time1, time_t time0);

time_t mktime(struct tm* timeptr);

time_t mk_gmtime(const struct tm* timeptr);

struct tm* gmtime_r(const time_t* timer, struct tm* timeptr);

struct tm* localtime_r(const time_t* timer, struct tm* timeptr);

char* isotime_r(const struct tm* tmptr, char* buf);

uint8_t is_leap_year(int16_t year);

#define ONE_HOUR 3600

#define ONE_DEGREE 3600

#define ONE_DAY 86400UL

#define UNIX_OFFSET 946684800UL

#define NTP_OFFSET 3155673600UL

void set_dst(int (*)(const time_t*, int32_t*));

void set_zone(int32_t);
int32_t get_zone();
#endif