Ho provato questo:
Funziona:codice:char str[40]; struct tm orig, *new; time_t t1; memset (&orig, 0, sizeof (orig)); orig.tm_year = 2006 - 1900; orig.tm_mday = 1; orig.tm_mon = 1 - 1; strftime (str, sizeof (str), "%Y-%m-%d %H:%M:%S", &orig); printf ("%s\n", str); t1 = mktime (&orig); t1 += 6*3600; /* +6 ore */ new = localtime (&t1); strftime (str, sizeof (str), "%Y-%m-%d %H:%M:%S", new); printf ("%s\n", str);
2006-01-01 00:00:00
2006-01-01 06:00:00

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