Convert Java LocalDate to Date
May 11, 2019
java.time.LocalDate into java.util.Date. The LocalDate represents a date in the format yyyy-MM-dd such as 2019-05-08. We can use following method and constructor to create a Date object.
1. Date.from(instant): Obtains an instance of
Date from an Instant object. We can use ZonedDateTime or Timestamp to get Instant. The ZonedDateTime and Timestamp can be obtained using LocalDateTime and LocalDateTime can be obtained using LocalDate.
2. Date(long date): Constructor that creates
Date object and initializes it to represent the specified number of milliseconds. We can use Timestamp.getTime() to get time in milliseconds.
Contents
1. Using LocalDate.atTime
LocalDate.atTime method combines this date with a given time to create a LocalDateTime. The LocalDateTime.atZone combines this date-time with a time-zone to create a ZonedDateTime. The ZonedDateTime.toInstant converts this date-time to an Instant. Now we will pass this Instant instance to Date.from method that will return a java.util.Date instance.
Example:
LocalDate localDate = LocalDate.parse("2019-05-08");
Instant instant = localDate.atTime(LocalTime.MIDNIGHT).atZone(ZoneId.systemDefault()).toInstant();
Date date = Date.from(instant);
System.out.println(date); //Wed May 08 00:00:00 IST 2019
2. Using LocalDate.atStartOfDay
Example-1:LocalDate.atStartOfDay(zone) returns a zoned date-time from this date at the earliest valid time according to the rules in the time-zone.
LocalDate localDate = LocalDate.parse("2019-05-08");
Instant instant = localDate.atStartOfDay(ZoneId.systemDefault()).toInstant();
Date date = Date.from(instant);
System.out.println(date); //Wed May 08 00:00:00 IST 2019
LocalDate.atStartOfDay() combines this date with the time of midnight to create a LocalDateTime at the start of this date.
LocalDate localDate = LocalDate.parse("2019-05-08");
Instant instant = localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant();
Date date = Date.from(instant);
System.out.println(date); //Wed May 08 00:00:00 IST 2019
3. Using LocalDateTime.of
LocalDateTime.of obtains an instance of LocalDateTime from a date and time.
Example:
LocalDate localDate = LocalDate.parse("2019-05-08");
Instant instant = LocalDateTime.of(localDate, LocalTime.MIDNIGHT).atZone(ZoneId.systemDefault()).toInstant();
Date date = Date.from(instant);
System.out.println(date); //Wed May 08 00:00:00 IST 2019
4. Using Timestamp.valueOf
Timestamp.valueOf(dateTime) obtains an instance of Timestamp from a LocalDateTime object.
Example-1: Instantiate
LocalDateTime using LocalDate.atTime method.
LocalDate localDate = LocalDate.parse("2019-05-08");
Instant instant = Timestamp.valueOf(localDate.atTime(LocalTime.MIDNIGHT)).toInstant();
Date date = Date.from(instant);
System.out.println(date); //Wed May 08 00:00:00 IST 2019
LocalDateTime using LocalDateTime.of method.
LocalDate localDate = LocalDate.parse("2019-05-08");
Instant instant = Timestamp.valueOf(LocalDateTime.of(localDate, LocalTime.MIDNIGHT)).toInstant();
Date date = Date.from(instant);
System.out.println(date); //Wed May 08 00:00:00 IST 2019
Date using Timestamp.getTime() method.
LocalDate localDate = LocalDate.parse("2019-05-08");
Timestamp timestamp = Timestamp.valueOf(localDate.atTime(LocalTime.MIDNIGHT));
Date date = new Date(timestamp.getTime());
System.out.println(date); //Wed May 08 00:00:00 IST 2019
Complete Example
LocalDateToDate.java
package com.concretepage;
import java.sql.Timestamp;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.util.Date;
public class LocalDateToDate {
public static void main(String[] args) {
LocalDate localDate = LocalDate.parse("2019-05-08");
Instant instant = localDate.atTime(LocalTime.MIDNIGHT).atZone(ZoneId.systemDefault()).toInstant();
Date date = Date.from(instant);
System.out.println(date);
instant = localDate.atStartOfDay(ZoneId.systemDefault()).toInstant();
date = Date.from(instant);
System.out.println(date);
instant = localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant();
date = Date.from(instant);
System.out.println(date);
instant = LocalDateTime.of(localDate, LocalTime.MIDNIGHT).atZone(ZoneId.systemDefault()).toInstant();
date = Date.from(instant);
System.out.println(date);
instant = Timestamp.valueOf(localDate.atTime(LocalTime.MIDNIGHT)).toInstant();
date = Date.from(instant);
System.out.println(date);
instant = Timestamp.valueOf(LocalDateTime.of(localDate, LocalTime.MIDNIGHT)).toInstant();
date = Date.from(instant);
System.out.println(date);
Timestamp timestamp = Timestamp.valueOf(localDate.atTime(LocalTime.MIDNIGHT));
date = new Date(timestamp.getTime());
System.out.println(date);
}
}
Wed May 08 00:00:00 IST 2019 Wed May 08 00:00:00 IST 2019 Wed May 08 00:00:00 IST 2019 Wed May 08 00:00:00 IST 2019 Wed May 08 00:00:00 IST 2019 Wed May 08 00:00:00 IST 2019 Wed May 08 00:00:00 IST 2019
References
Java LocalDateJava DateTimeFormatter
