How to create Java time instant from pattern?

Question

Consider a code:

TemporalAccessor date = DateTimeFormatter.ofPattern(\"yyyy-MM-dd\").parse(\"9999-12-31\");
Instant.from(date);

The last line t

Answer 1

Either you are only interested in the date itself (31st of December 9999), in which case the appropriate type would be a LocalDate:

LocalDate date = LocalDate.parse("9999-12-31");

Or you do want an Instant, in which case you need to set a time and time zone, for example, 00:00 in Tokyo:

Instant instant = date.atStartOfDay(ZoneId.of("Asia/Tokyo")).toInstant();