java.util.date to String using DateTimeFormatter

Question

How can I convert a java.util.Date to String using

 DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss")

The Date object which I get is passed

DateTime now = new DateTime(date);

Naresh

Please show your complete code – Richart

Possible duplicate of: #5684228 – Ctenophore

@PeterKuebler I am trying to use DateTimeFormatter – Naresh

Why not use SimpleDateFormat? – Sibeal

new DateTime(date).toString(dateTimeFormatter) – Sibeal

@CorkKochi If you are on Java 8 you should consider using the new java time api instead of the legacy Date api or joda time. – Phraseologist

not clear for me, is DateTimeFormatter comming from java.time.format.DateTimeFormatter; or org.joda.time.format.DateTimeFormatter??? – Shadow

I assume it's Joda, but I don't know why it's tagged java-8. – Sibeal

@Sibeal Any possibilities to do in java8 – Naresh

It's not clear what you're trying to do. Joda, Java and Java 8 have separate date libraries, with their own formatting and parsing mechanisms, all of which are well documented on this site and elsewhere. What exactly are you looking for? – Sibeal

@Sibeal can you tell how it can be done in java8, I searched but I couldnt find – Naresh

FYI: The Joda-Time project, now in maintenance mode, advises migration to the java.time classes. – Louielouis

Answer 1

If you are using Java 8, you should not use java.util.Date in the first place (unless you receive the Date object from a library that you have no control over).

In any case, you can convert a Date to a java.time.Instant using:

Date date = ...;
Instant instant = date.toInstant();

Since you are only interested in the date and time, without timezone information (I assume everything is UTC), you can convert that instant to a LocalDateTime object:

LocalDateTime ldt = instant.atOffset(ZoneOffset.UTC).toLocalDateTime();

Finally you can print it with:

DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss");
System.out.println(ldt.format(fmt));

Or use the predefined formatter, DateTimeFormatter.ISO_LOCAL_DATE_TIME.

System.out.println(ldt.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME));

Note that if you don't provide a formatter, calling ldt.toString gives output in standard ISO 8601 format (including milliseconds) - that may be acceptable for you.

Phraseologist

The service I am using is returning a java.util.Date object – Naresh

@CorkKochi If you must use a java.util.Date object, convert as shown in this Answer. See new conversion methods added to the old classes, such as Date.from( Instant ) and Date::toInstant(). – Louielouis

There is nothing wrong with Date. It is simply a wrapper around an epoch timestamp. – Sake

Answer 2

java.util.Date date = new java.util.Date(System.currentTimeMillis());
Instant instant = date.toInstant();

LocalDateTime ldt = instant.atZone(ZoneId.systemDefault()).toLocalDateTime();

DateTimeFormatter fmt = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss");
System.out.println(ldt.format(fmt));

Pigling

Answer 3

Summarizing and simplifying @assylias and @Adrian Faur:

 dateTimeFormatter.format(date.toInstant().atZone(ZoneId.systemDefault()));

No need to convert it to LocalDateTime, format accept TemporalAccessor

Elli

Answer 4

DateTime dt = new DateTime(date);
DateTimeFormatter dtf = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss");
dt.toString(dtf)

Naresh

dt.toString(DateTimeFormatter.ISO_INSTANT) – Harty

Answer 5

DateTimeFormatterOBJECT=DateTimeFormatter.ofPattern("DD/MMM/YYYY HH//MM/SS");

String MyDateAndTime= LocalDate.now().format(DateTimeFormatterOBJECT);

Yoshida

You can use above code to get simple date in your own format by specifying the format in first line of code and you can also use any plus or minus date function in 2nd line of code ; – Yoshida

To add clarifications to your answer, please edit your answer instead of using comments. – Outleap

Answer 6

You can use the joda time formatter class:

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
# conflict with import java.time.format.DateTimeFormatter;

final DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss")
            .withZone(DateTimeZone.UTC);

    System.out.println(DateTime.now().toString(formatter));

Ansell

You can also use withZoneUTC() instead of withZone(DateTimeZone.UTC) which results in an unnecessary import of DateTimeZone class. – Inviolable

Answer 7

since I asume you are using joda API: ergo, DateTimeFormatter is comming from org.joda.time.format.DateTimeFormatter:

 String dateTime = "02-13-2017 18:20:30";
// Format for input
DateTimeFormatter dtf = DateTimeFormat.forPattern("MM-dd-yyyy HH:mm:ss");
// Parsing the date
DateTime jodatime = dtf.parseDateTime(dateTime);

System.out.println(jodatime );

Pietrek

@CorkKochi I hope you're not actually calling new DateTime(new Date()). – Sibeal

@Sibeal I posted the answer – Naresh