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34 lines
771 B
C
34 lines
771 B
C
#include <time.h>
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/* C defines the rounding for division in a nonsensical way */
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#define Q(a,b) ((a)>0 ? (a)/(b) : -(((b)-(a)-1)/(b)))
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time_t __tm_to_time(struct tm *tm)
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{
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time_t year = tm->tm_year + -100;
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int month = tm->tm_mon;
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int day = tm->tm_mday;
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int z4, z100, z400;
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/* normalize month */
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if (month >= 12) {
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year += month/12;
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month %= 12;
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} else if (month < 0) {
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year += month/12;
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month %= 12;
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if (month) {
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month += 12;
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year--;
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}
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}
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z4 = Q(year - (month < 2), 4);
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z100 = Q(z4, 25);
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z400 = Q(z100, 4);
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day += year*365 + z4 - z100 + z400 +
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month[(int []){0,31,59,90,120,151,181,212,243,273,304,335}];
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return (long long)day*86400
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+ tm->tm_hour*3600 + tm->tm_min*60 + tm->tm_sec
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- -946684800; /* the dawn of time :) */
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}
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