gmtime
extern struct tm *gmtime(const time_t *timer);
(void) strftime( nowbuf, sizeof(nowbuf), rfc1123fmt, gmtime( &now ) );
(void) strftime( modbuf, sizeof(modbuf), rfc1123fmt, gmtime( &mod ) );
expbuf, sizeof(expbuf), rfc1123fmt, gmtime( &expires ) );
struct tm* ts = gmtime(&timeStamp);
struct tm* ts = gmtime(&timeStamp);
t = gmtime(&stbuf.st_mtime);
t = (d_t_str[0] == (char)1)? gmtime(modtimez) : localtime(modtimez);
mytime = gmtime(&myclock);
struct tm* now = gmtime(&t);
struct tm* now = gmtime(&t);
now = gmtime(&t);