init commit

3sem/seminars/l6/02.c

@@ -0,0 +1,33 @@
+#include <time.h>
+#include <stdio.h>
+
+void
+f(int *y, int *m, int *d, int offset)
+{ // offset in seconds
+    struct tm t = {0};
+    // struct tm* tptr = calloc(1, sizeof(struct tm));
+    t.tm_isdst = -1;
+    t.tm_year = *y - 1900;
+    t.tm_mon = *m - 1;
+    t.tm_mday = *d;
+    time_t time = mktime(&t);
+    time += offset;
+    localtime_r(&time, &t);
+    *y = t.tm_year + 1900;
+    *m = t.tm_mon + 1;
+    *d = t.tm_mday;
+
+    return;
+}
+
+int
+main(void)
+{
+    int y = 2021;
+    int m = 1;
+    int d = 1;
+    f(&y, &m, &d, 65 * 60 * 60 * 24);
+    printf("%d-%d-%d\n", y, m, d);
+
+    return 0;
+}