char *t, **mp;
struct tm tm; char *t;
atot(p, store)	char *p;	time_t *store;{	static struct tm *lt;	char *t, **mp;	time_t tval;	int day, month, year;	if (!*p) {		*store = 0;		return (0);	}	if (!lt) {		unsetenv("TZ");		(void)time(&tval);		lt = localtime(&tval);	}	if (!(t = strtok(p, " \t")))		goto bad;	for (mp = months;; ++mp) {		if (!*mp)			goto bad;		if (!strncasecmp(*mp, t, 3)) {			month = mp - months + 1;			break;		}	}	if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))		goto bad;	day = atoi(t);	if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))		goto bad;	year = atoi(t);	if (day < 1 || day > 31 || month < 1 || month > 12 || !year)		goto bad;	if (year < 100)		year += TM_YEAR_BASE;	if (year <= EPOCH_YEAR)bad:		return (1);	tval = isleap(year) && month > 2;	for (--year; year >= EPOCH_YEAR; --year)		tval += isleap(year) ?		    DAYSPERLYEAR : DAYSPERNYEAR;	while (--month)		tval += dmsize[month];	tval += day;	tval = tval * HOURSPERDAY * MINSPERHOUR * SECSPERMIN;	tval -= lt->tm_gmtoff;	*store = tval;	return (0);}