Function match_alpha

date.c:459–513

* Parse month, weekday, or timezone name */

* Parse month, weekday, or timezone name
*/
static int match_alpha(const char *date, struct tm *tm, int *offset)
{
	int i;

	for (i = 0; i < 12; i++) {
		int match = match_string(date, month_names[i]);
		if (match >= 3) {
			tm->tm_mon = i;
			return match;
		}
	}

	for (i = 0; i < 7; i++) {
		int match = match_string(date, weekday_names[i]);
		if (match >= 3) {
			tm->tm_wday = i;
			return match;
		}
	}

	for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
		int match = match_string(date, timezone_names[i].name);
		if (match >= 3 || match == strlen(timezone_names[i].name)) {
			int off = timezone_names[i].offset;

			/* This is bogus, but we like summer */
			off += timezone_names[i].dst;

			/* Only use the tz name offset if we don't have anything better */
			if (*offset == -1)
				*offset = 60*off;

			return match;
		}
	}

	if (match_string(date, "PM") == 2) {
		tm->tm_hour = (tm->tm_hour % 12) + 12;
		return 2;
	}

	if (match_string(date, "AM") == 2) {
		tm->tm_hour = (tm->tm_hour % 12) + 0;
		return 2;
	}

	/* ISO-8601 allows yyyymmDD'T'HHMMSS, with less precision */
	if (*date == 'T' && isdigit(date[1]) && tm->tm_hour == -1) {
		tm->tm_min = tm->tm_sec = 0;
		return 1;
	}

	/* BAD CRAP */
	return skip_alpha(date);
}

static int set_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
{