Date Time Util
Different Types of TimeStamp in Java.
Java provides different types of timestamp. Important date time representation involves LocalTime, UTC Time, TimeZone Information.
LocalDate.
LocalDate today = LocalDate.now();
System.out.println("LocalDate " + today);
// LocalDate 2024-02-08
LocalTime.
LocalTime now = LocalTime.now();
System.out.println("LocalTime: " + now);
// LocalTime: 14:45:30.123456
LocalDateTime.
LocalDateTime now = LocalDateTime.now();
System.out.println("LocalDateTime: " + now);
// LocalDateTime: 2024-02-08T14:45:30.123456
ZoneDateTime.
ZonedDateTime zonedNow = ZonedDateTime.now(ZoneId.of("Asia/Kolkata"));
System.out.println("ZonedDateTime: " + zonedNow);
// ZonedDateTime: 2024-02-08T20:15:30.123456+05:30[Asia/Kolkata]
Instant, EpochBased.
It is always in UTC.
Instant now = Instant.now();
System.out.println("Instant (Epoch Time UTC): " + now);
// Instant (Epoch Time UTC): 2024-02-08T14:45:30.123456Z
Epoch Time.
Seconds & Milliseconds Since 1970-01-01 00:00:00 UTC.
long epochSeconds = Instant.now().getEpochSecond(); // Epoch in seconds
long epochMillis = Instant.now().toEpochMilli(); // Epoch in milliseconds
System.out.println("Epoch Seconds: " + epochSeconds);
System.out.println("Epoch Milliseconds: " + epochMillis);
// Epoch Seconds: 1707382200
// Epoch Milliseconds: 1707382200123
| Type | Contains | Example |
|---|---|---|
| LocalDate | Date (YYYY-MM-DD) | 2024-02-08 |
| LocalTime | Time (HH:MM:SS) | 14:45:30.123456 |
| LocalDateTime | Date + Time | 2024-02-08T14:45:30.123456 |
| ZonedDateTime | Date + Time + Zone | 2024-02-08T20:15:30.123456+05:30[Asia/Kolkata] |
| Instant | Epoch-Based UTC Time | 2024-02-08T14:45:30.123456Z |
| Epoch Time | Seconds/Milliseconds since 1970 | 1707382200 (seconds), 1707382200123 (milliseconds) |
Conversion.
| Type | Method |
|---|---|
| LocalDate to LocalDateTime | date.atTime(LocalTime.now()) |
| Format | Example Code |
|---|---|
| Inline Code | System.out.println("Hello, World!"); |
| Block Code | |