You can use strptime()
to convert connectTime
to a struct tm
and then use mktime()
on the latter to convert the it to a time_t
.
char * connectTime = "2013-10-19 01:10:00";
struct tm tmConnect = {0};
time_t timeConnect;
char * pc = strptime(connectTime, "%Y-%m-%d %H:%M:%S", &tmConnect);
if ((NULL == pc) || ('\0' != *(pc + strlen(connectTime))) /* The second condition assume connectTime does not hold any more characters after "... 01:10:00". */
{
perror("strptime() failed");
/* handle error */
}
else
{
timeConnect = mktime(&tmConnect);
}
To then calculate the difference in seconds use difftime()
, as mentioned by in Grijesh Chauhan's comment:
time_t disconnectTime;
disconnectTime = time(NULL);
double diff = difftime(disconnectTime, timeConnect);