#pragma once

#include <Arduino.h>

//convenience macros to convert to and from tm years 
#define  tmYearToCalendar(Y) ((Y) + 1970)  // full four digit year 
#define  CalendarYrToTm(Y)   ((Y) - 1970)
#define  tmYearToY2k(Y)      ((Y) - 30)    // offset is from 2000
#define  y2kYearToTm(Y)      ((Y) + 30)

/*============================================================================*/

typedef unsigned long timestamp_t;

typedef struct {
	uint8_t Second;
	uint8_t Minute;
	uint8_t Hour;
	//uint8_t Wday;   // day of week, sunday is day 1
	uint8_t Day;
	uint8_t Month;
	uint8_t Year;   // offset from 1970;
} 	tmElements_t;

/* low level functions to convert to and from system time                     */
void breakTime(const timestamp_t time, tmElements_t &tm);  // break timestamp_t into elements
timestamp_t makeTimestamp(const tmElements_t &tm);  // convert time elements into timestamp_t