Convert java.time.LocalDate into java.util.Date type
JavaJava 8Java TimeJava Problem Overview
I want to convert java.time.LocalDate
into java.util.Date
type. Because I want to set the date into JDateChooser
. Or is there any date chooser that supports java.time
dates?
Java Solutions
Solution 1 - Java
Date date = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
That assumes your date chooser uses the system default timezone to transform dates into strings.
Solution 2 - Java
Here's a utility class I use to convert the newer java.time
classes to java.util.Date
objects and vice versa:
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;
public class DateUtils {
public static Date asDate(LocalDate localDate) {
return Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
}
public static Date asDate(LocalDateTime localDateTime) {
return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
}
public static LocalDate asLocalDate(Date date) {
return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDate();
}
public static LocalDateTime asLocalDateTime(Date date) {
return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDateTime();
}
}
Edited based on @Oliv comment.
Solution 3 - Java
Disclaimer: For illustrating existing java apis only. Should not be used in production code.
You can use java.sql.Date.valueOf()
method as:
Date date = java.sql.Date.valueOf(localDate);
No need to add time and time zone info here because they are taken implicitly.
See https://stackoverflow.com/questions/33066904/simpliest-java8-localdate-to-java-util-date-conversion-and-vice-versa
Solution 4 - Java
java.time has the Temporal interface which you can use to create Instant objects from most of the the time classes. Instant represents milliseconds on the timeline in the Epoch - the base reference for all other dates and times.
We need to convert the Date into a ZonedDateTime, with a Time and a Zone, to do the conversion:
LocalDate ldate = ...;
Instant instant = Instant.from(ldate.atStartOfDay(ZoneId.of("GMT")));
Date date = Date.from(instant);
Solution 5 - Java
This works for me:
java.util.Date d = new SimpleDateFormat("yyyy-MM-dd").parse(localDate.toString());
https://docs.oracle.com/javase/8/docs/api/java/time/LocalDate.html#toString--
Solution 6 - Java
In order to create a java.util.Date from a java.time.LocalDate, you have to
- add a time to the LocalDate
- interpret the date and time within a time zone
- get the number of seconds / milliseconds since epoch
- create a java.util.Date
The code might look as follows:
LocalDate localDate = LocalDate.now();
Date date = new Date(localDate.atStartOfDay(ZoneId.of("America/New_York")).toEpochSecond() * 1000);
Solution 7 - Java
Kotlin Solution:
-
Paste this extension function somewhere.
fun LocalDate.toDate(): Date = Date.from(this.atStartOfDay(ZoneId.systemDefault()).toInstant())
-
Use it, and never google this again.
val myDate = myLocalDate.toDate()
Solution 8 - Java
localDate.format(DateTimeFormatter.ofPattern("dd/MM/yyyy"));
Solution 9 - Java
public static Date convertToTimeZone(Date date, String tzFrom, String tzTo) {
return Date.from(LocalDateTime.ofInstant(date.toInstant(), ZoneId.of(tzTo)).atZone(ZoneId.of(tzFrom)).toInstant());
}
Solution 10 - Java
LocalDate date = LocalDate.now();
DateFormat formatter = new SimpleDateFormat("dd-mm-yyyy");
try {
Date utilDate= formatter.parse(date.toString());
} catch (ParseException e) {
// handle exception
}
Solution 11 - Java
Simple
public Date convertFrom(LocalDate date) {
return java.sql.Timestamp.valueOf(date.atStartOfDay());
}
Solution 12 - Java
java.util.Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());