Java Get Current Timestamp

방법

1. System.currentTimeMillis();

public class GetCurrentTimestamp {
    public static void main(String[] args) {
        long currentTimeMillis = System.currentTimeMillis();
        System.out.println("Current Timestamp: " + currentTimeMillis + " milliseconds");
    }
}

2. java.util.Date()

import java.util.Date;
 
public class GetCurrentTimestamp {
    public static void main(String[] args) {
        Date currentDate = new Date();
        System.out.println("Current Timestamp: " + currentDate.getTime() + " milliseconds");
    }
}

3. java.time.Instant

import java.time.Instant;
 
public class GetCurrentTimestamp {
    public static void main(String[] args) {
        Instant currentInstant = Instant.now();
        System.out.println("Current Timestamp: " + currentInstant.toEpochMilli() + " milliseconds");
    }
}

4. java.time.LocalDateTime and java.time.ZoneId

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
 
public class GetCurrentTimestamp {
    public static void main(String[] args) {
        LocalDateTime localDateTime = LocalDateTime.now();
        ZoneId zoneId = ZoneId.systemDefault();
        ZonedDateTime zonedDateTime = ZonedDateTime.of(localDateTime, zoneId);
        long currentTimestamp = zonedDateTime.toInstant().toEpochMilli();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        String formattedDateTime = localDateTime.format(formatter);
        System.out.println("Current Timestamp: " + currentTimestamp + " milliseconds");
        System.out.println("Formatted Date-Time: " + formattedDateTime);
    }
}

5. java.sql.Timestamp

public class GetCurrentTimestamp {
    public static void main(String[] args) {
        Timestamp currentTimestamp = new Timestamp(System.currentTimeMillis());
        System.out.println("Current Timestamp: " + currentTimestamp.getTime() + " milliseconds");
        System.out.println("Formatted Timestamp: " + currentTimestamp.toString());
    }
}