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Java LocalDate to Date

By Arvind Rai, May 11, 2019
On this page we will provide how to convert 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.


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 
Example-2: 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 
Example-2: Instantiate 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 
Example-3: Create 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);

  }
} 
Output
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 LocalDate
Java DateTimeFormatter
POSTED BY
ARVIND RAI
ARVIND RAI
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