Date & Time API (Java 8+)

Java 8 introduced a new Date & Time API (java.time package) to replace the old java.util.Date.

Core Classes

LocalDate

Represents a date without time.

LocalDate today = LocalDate.now();
LocalDate birthday = LocalDate.of(1995, 5, 15);

LocalTime

Represents time without date.

LocalTime now = LocalTime.now();
LocalTime lunchTime = LocalTime.of(12, 30);

LocalDateTime

Combines date and time.

LocalDateTime now = LocalDateTime.now();
LocalDateTime meeting = LocalDateTime.of(2024, 1, 15, 14, 30);

ZonedDateTime

Date and time with time zone.

ZonedDateTime zonedNow = ZonedDateTime.now();
ZonedDateTime tokyo = ZonedDateTime.now(ZoneId.of("Asia/Tokyo"));

Period and Duration

Period - Date-based amount (years, months, days) Duration - Time-based amount (hours, minutes, seconds)

Period period = Period.between(LocalDate.of(2020, 1, 1), LocalDate.now());
Duration duration = Duration.between(LocalTime.of(9, 0), LocalTime.now());

Formatting

LocalDateTime now = LocalDateTime.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm");
String formatted = now.format(formatter);

Quiz