34 lines
592 B
C
Executable File
34 lines
592 B
C
Executable File
#include <time.h>
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#include <stdio.h>
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void
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f(int *y, int *m, int *d, int offset)
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{ // offset in seconds
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struct tm t = {0};
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// struct tm* tptr = calloc(1, sizeof(struct tm));
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t.tm_isdst = -1;
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t.tm_year = *y - 1900;
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t.tm_mon = *m - 1;
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t.tm_mday = *d;
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time_t time = mktime(&t);
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time += offset;
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localtime_r(&time, &t);
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*y = t.tm_year + 1900;
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*m = t.tm_mon + 1;
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*d = t.tm_mday;
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return;
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}
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int
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main(void)
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{
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int y = 2021;
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int m = 1;
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int d = 1;
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f(&y, &m, &d, 65 * 60 * 60 * 24);
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printf("%d-%d-%d\n", y, m, d);
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return 0;
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}
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