c - Getting timestamp with date and time including microseconds -

for error-logbook want create timestamp date , time, including microseconds. should have form 2016.07.19 13:59:31:123.456

i found lot of examples of time_t, resolution seconds...

you can use gettimeofday:

#include <time.h> #include <sys/time.h> .... struct timeval tv; gettimeofday(&tv, null); 

where struct timeval defined as:

struct timeval {     time_t      tv_sec;     /* seconds */     suseconds_t tv_usec;    /* microseconds */ }; 

you can use gmtime split seconds part:

struct tm *ts = gmtime(&tv.tv_sec); 

where struct tm defined as:

          struct tm {               int tm_sec;         /* seconds */               int tm_min;         /* minutes */               int tm_hour;        /* hours */               int tm_mday;        /* day of month */               int tm_mon;         /* month */               int tm_year;        /* year */               int tm_wday;        /* day of week */               int tm_yday;        /* day in year */               int tm_isdst;       /* daylight saving time */           }; 

the members of tm structure are:

• tm_sec number of seconds after minute, in range 0 59, can 60 allow leap seconds.

• tm_min number of minutes after hour, in range 0 59.

• tm_hour number of hours past midnight, in range 0 23.

• tm_mday day of month, in range 1 31.

• tm_mon number of months since january, in range 0 11.

• tm_year number of years since 1900.

• tm_wday number of days since sunday, in range 0 6.

• tm_yday number of days since january 1, in range 0 365.

• tm_isdst flag indicates whether daylight saving time in effect @ time described. value positive if daylight saving time in effect, 0 if not, , negative if infor- mation not available.

edit:

windows doesn't have gettimeofday. here's implementation can use:

int gettimeofday(struct timeval *tv, struct timezone *tz) {     const unsigned __int64 epoch_diff = 11644473600000000;     unsigned __int64 tmp;     filetime t;      if (tv) {         getsystemtimeasfiletime(&t);          tmp = 0;         tmp |= t.dwhighdatetime;         tmp <<= 32;         tmp |= t.dwlowdatetime;          tmp /= 10;         tmp -= epoch_diff;         tv->tv_sec = (long)(tmp / 1000000);         tv->tv_usec = (long)(tmp % 1000000);     }      return 0; }