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?
Kotlin Solution:
1) Paste this extension function somewhere.
fun LocalDate.toDate(): Date = Date.from(this.atStartOfDay(ZoneId.systemDefault()).toInstant())
2) Use it, and never google this again.
val myDate = myLocalDate.toDate()
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());
}
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);
java.util.Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
Simple
public Date convertFrom(LocalDate date) {
return java.sql.Timestamp.valueOf(date.atStartOfDay());
}
LocalDate date = LocalDate.now();
DateFormat formatter = new SimpleDateFormat("dd-mm-yyyy");
try {
Date utilDate= formatter.parse(date.toString());
} catch (ParseException e) {
// handle exception
}
In order to create a java.util.Date from a java.time.LocalDate, you have to
The code might look as follows:
LocalDate localDate = LocalDate.now();
Date date = new Date(localDate.atStartOfDay(ZoneId.of("America/New_York")).toEpochSecond() * 1000);
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 LocalDate to java.util.Date and vice versa simpliest conversion?
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.
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--
Source: Stackoverflow.com