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  1. #include <iostream>
  2.  
  3.  
  4. // CODE FROM TIME LIBRARY, YOU DON'T NEED TO COPY THAT
  5.  
  6. typedef struct  { 
  7.   uint8_t Second; 
  8.   uint8_t Minute; 
  9.   uint8_t Hour; 
  10.   uint8_t Wday;   // day of week, sunday is day 1
  11.   uint8_t Day;
  12.   uint8_t Month; 
  13.   uint8_t Year;   // offset from 1970; 
  14. } 	tmElements_t, TimeElements, *tmElementsPtr_t;
  15.  
  16. /* Useful Constants */
  17. #define SECS_PER_MIN  ((time_t)(60UL))
  18. #define SECS_PER_HOUR ((time_t)(3600UL))
  19. #define SECS_PER_DAY  ((time_t)(SECS_PER_HOUR * 24UL))
  20. #define DAYS_PER_WEEK ((time_t)(7UL))
  21. #define SECS_PER_WEEK ((time_t)(SECS_PER_DAY * DAYS_PER_WEEK))
  22. #define SECS_PER_YEAR ((time_t)(SECS_PER_DAY * 365UL)) // TODO: ought to handle leap years
  23. #define SECS_YR_2000  ((time_t)(946684800UL)) // the time at the start of y2k
  24.  
  25. #define LEAP_YEAR(Y)     ( ((1970+(Y))>0) && !((1970+(Y))%4) && ( ((1970+(Y))%100) || !((1970+(Y))%400) ) )
  26.  
  27. static  const uint8_t monthDays[]={31,28,31,30,31,30,31,31,30,31,30,31}; // API starts months from 1, this array starts from 0
  28.  
  29. time_t makeTime(const tmElements_t &tm){   
  30. // assemble time elements into time_t 
  31. // note year argument is offset from 1970 (see macros in time.h to convert to other formats)
  32. // previous version used full four digit year (or digits since 2000),i.e. 2009 was 2009 or 9
  33.  
  34.   int i;
  35.   uint32_t seconds;
  36.  
  37.   // seconds from 1970 till 1 jan 00:00:00 of the given year
  38.   seconds= tm.Year*(SECS_PER_DAY * 365);
  39.   for (i = 0; i < tm.Year; i++) {
  40.     if (LEAP_YEAR(i)) {
  41.       seconds += SECS_PER_DAY;   // add extra days for leap years
  42.     }
  43.   }
  44.  
  45.   // add days for this year, months start from 1
  46.   for (i = 1; i < tm.Month; i++) {
  47.     if ( (i == 2) && LEAP_YEAR(tm.Year)) { 
  48.       seconds += SECS_PER_DAY * 29;
  49.     } else {
  50.       seconds += SECS_PER_DAY * monthDays[i-1];  //monthDay array starts from 0
  51.     }
  52.   }
  53.   seconds+= (tm.Day-1) * SECS_PER_DAY;
  54.   seconds+= tm.Hour * SECS_PER_HOUR;
  55.   seconds+= tm.Minute * SECS_PER_MIN;
  56.   seconds+= tm.Second;
  57.   return (time_t)seconds; 
  58. }
  59.  
  60. // END OF CODE FROM TIME LIBRARY
  61.  
  62.  
  63.  
  64.  
  65. int main()
  66. {
  67. 	tmElements_t
  68. 		tmElements1,
  69. 		tmElements2;
  70.  
  71. 	tmElements1.Year   = 2019 - 1970;
  72. 	tmElements1.Month  = 12;
  73. 	tmElements1.Day    = 24;
  74. 	tmElements1.Hour   = 9;
  75. 	tmElements1.Minute = 0;
  76. 	tmElements1.Second = 0;
  77.  
  78. 	tmElements2.Year   = 2019 - 1970;
  79. 	tmElements2.Month  = 12;
  80. 	tmElements2.Day    = 24;
  81. 	tmElements2.Hour   = 9;
  82. 	tmElements2.Minute = 59;
  83. 	tmElements2.Second = 59;
  84.  
  85. 	time_t
  86. 		time1 = makeTime(tmElements1),
  87. 		time2 = makeTime(tmElements2),
  88. 		timeDifference = abs(time2 - time1);
  89.  
  90. 	printf( "time difference is %d seconds", timeDifference);
  91.  
  92. 	return 0;
  93. }
Success #stdin #stdout 0s 4432KB
comments (?)
stdin 
Standard input is empty
stdout 
time difference is 3599 seconds
https://ideone.com/XtoXGw
language:
C++ 4.3.2 (gcc-4.3.2)
created:
5 years ago
visibility:
secret

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