/* * The arguments are the number of minutes of time * you are westward from Greenwich and whether DST is in effect. * It returns a string * giving the name of the local timezone. * * Sorry, I don't know all the names. */static struct zone {	int	offset;	char	*stdzone;	char	*dlzone;} zonetab[] = {	4*60, "AST", "ADT",		/* Atlantic */	5*60, "EST", "EDT",		/* Eastern */	6*60, "CST", "CDT",		/* Central */	7*60, "MST", "MDT",		/* Mountain */	8*60, "PST", "PDT",		/* Pacific */	0, "GMT", 0,			/* Greenwich */	-1};char *timezone(zone, dst){	register struct zone *zp;	static char czone[10];	char *sign;	for (zp=zonetab; zp->offset!=-1; zp++)		if (zp->offset==zone) {			if (dst && zp->dlzone)				return(zp->dlzone);			if (!dst && zp->stdzone)				return(zp->stdzone);		}	if (zone<0) {		zone = -zone;		sign = "+";	} else		sign = "-";	sprintf(czone, "GMT%s%d:%02d", sign, zone/60, zone%60);	return(czone);}