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struct timeval
{
int tv_sec;
int tv_usec;
};
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struct timezone
{
int tv_minuteswest;
int tv_dsttime;
};
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struct timespec
{
long int tv_sec;
long int tv_nsec;
};
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struct tm
{
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
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