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#include <time.h>
#include <stdio.h>
#include <assert.h>
int main() {
struct tm soon = {};
soon.tm_sec = 0;
soon.tm_min = 0;
soon.tm_hour = 0;
soon.tm_mday = 1;
soon.tm_mon = 0;
soon.tm_year = 70;
time_t result;
time_t expected_result = 0;
// This should be epoch.
result = timegm(&soon);
printf("epoch: %ld\n", result);
assert(result == expected_result);
soon.tm_sec = 12;
soon.tm_min = 8;
soon.tm_hour = 16;
soon.tm_mday = 17;
soon.tm_mon = 4;
soon.tm_year = 122;
expected_result = 1652803692;
result = timegm(&soon);
// On my host, this returned 1652803692, verify this.
printf("epoch: %ld\n", result);
assert(result == expected_result);
soon.tm_sec = 45;
soon.tm_min = 42;
soon.tm_hour = 17;
soon.tm_mday = 16;
soon.tm_mon = 8;
soon.tm_year = 69;
expected_result = -9181035;
result = timegm(&soon);
// On my host, this returned -9181035, verify this.
printf("epoch: %ld\n", result);
assert(result == expected_result);
return 0;
}
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