Here's a ready snippet when strptime is not available:
#include <stddef.h>#include <time.h> #include <stdio.h> time_t string_to_seconds(const char *timestamp_str){ struct tm tm; time_t seconds; int r; if (timestamp_str == NULL) { printf("null argument\n"); return (time_t)-1; } r = sscanf(timestamp_str, "%d-%d-%d %d:%d:%d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec); if (r != 6) { printf("expected %d numbers scanned in %s\n", r, timestamp_str); return (time_t)-1; } tm.tm_year -= 1900; tm.tm_mon -= 1; tm.tm_isdst = 0; seconds = mktime(&tm); if (seconds == (time_t)-1) { printf("reading time from %s failed\n", timestamp_str); } return seconds;}Adjust youself a string in sscanf to what you need. To ignore time zone and convert always as GMT/UTC substract a timezone (or _timezone) from seconds (timezone global is defined in time.h. DST is already ignored by zeroing tm_isdst field of tm.
