"I want to convert the string "2011-10-23 08:46:10" to seconds. Why am I getting this error with this code. warning: comparison between pointer and integer [enabled by default] for lineCode:time_t epoch; struct tm tm; if (strptime("2011-10-23 08:46:10", "%Y-%m-%d %H:%M:%S", &tm) != NULL) { epoch = mktime(&tm); } else { // Handle error } printf("seconds since the Epoch: %ld\n", (long) epoch);Code:if (strptime("2011-10-23 08:46:10", "%Y-%m-%d %H:%M:%S", &tm) != NULL) {."