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24 lines
778 B
C
24 lines
778 B
C
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#include <time.h>
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time_t mktime (struct tm * timeptr)
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{
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int utcdiff = -3;
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const int mon_days [] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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unsigned long int tyears, tdays, leaps, utc_hrs;
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int i;
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tyears = timeptr->tm_year - 70 ;// tm->tm_year is from 1900.
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leaps = (tyears + 2) / 4; // no of next two lines until year 2100.
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i = (timeptr->tm_year - 100) / 100;
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leaps -= ( (i/4)*3 + i%4 );
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tdays = 0;
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for (i=0; i < timeptr->tm_mon; i++) tdays += mon_days[i];
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tdays += timeptr->tm_mday-1; // days of month passed.
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tdays = tdays + (tyears * 365) + leaps;
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utc_hrs = timeptr->tm_hour + utcdiff; // for your time zone.
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return (tdays * 86400) + (utc_hrs * 3600) + (timeptr->tm_min * 60) + timeptr->tm_sec;
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}
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