How create Date Object with values in java

Question

I need a date object for date 2014-02-11   I can t directly create it like this   Date myDate   new Date 2014  02  11     So I m doing like follows   Calendar myCalendar   new GregorianCalendar 2014  2  11   Date myDate   myCalendar getTime      Is there any easy way to create date object in java

User · Answer

I think your date comes from php and is written to html (dom) or? I have a php-function to prep all dates and timestamps. This return a formation that is be needed.

$timeForJS = timeop($datetimeFromDatabase['payedon'], 'js', 'local'); // save 10/12/2016 09:20 on var

this format can be used on js to create new Date...

<html>
   <span id="test" data-date="<?php echo $timeForJS; ?>"></span>
   <script>var myDate = new Date( $('#test').attr('data-date') );</script>
</html>

What i will say is, make your a own function to wrap, that make your life easyr. You can us my func as sample but is included in my cms you can not 1 to 1 copy and paste :)

    function timeop($utcTime, $for, $tz_output = 'system')
{
    // echo "<br>Current time ( UTC ): ".$wwm->timeop('now', 'db', 'system');
    // echo "<br>Current time (USER): ".$wwm->timeop('now', 'db', 'local');
    // echo "<br>Current time (USER): ".$wwm->timeop('now', 'D d M Y H:i:s', 'local');
    // echo "<br>Current time with user lang (USER): ".$wwm->timeop('now', 'datetimes', 'local');

    // echo '<br><br>Calculator test is users timezone difference != 0! Tested with "2014-06-27 07:46:09"<br>';
    // echo "<br>Old time (USER -> UTC): ".$wwm->timeop('2014-06-27 07:46:09', 'db', 'system');
    // echo "<br>Old time (UTC -> USER): ".$wwm->timeop('2014-06-27 07:46:09', 'db', 'local');

    /** -- */
    // echo '<br><br>a Time from db if same with user time?<br>';
    // echo "<br>db-time (2019-06-27 07:46:09) time left = ".$wwm->timeleft('2019-06-27 07:46:09', 'max');
    // echo "<br>db-time (2014-06-27 07:46:09) time left = ".$wwm->timeleft('2014-06-27 07:46:09', 'max', 'txt');

    /** -- */
    // echo '<br><br>Calculator test with other formats<br>';
    // echo "<br>2014/06/27 07:46:09: ".$wwm->ntimeop('2014/06/27 07:46:09', 'db', 'system');

    switch($tz_output){
        case 'system':
            $tz = 'UTC';
            break;

        case 'local':
            $tz = $_SESSION['wwm']['sett']['tz'];
            break;

        default:
            $tz = $tz_output;
            break;
    }

    $date = new DateTime($utcTime,  new DateTimeZone($tz));

    if( $tz != 'UTC' ) // Only time converted into different time zone
    {
        // now check at first the difference in seconds
        $offset = $this->tz_offset($tz);
        if( $offset != 0 ){
            $calc = ( $offset >= 0  ) ? 'add' : 'sub';
            // $calc = ( ($_SESSION['wwm']['sett']['tzdiff'] >= 0 AND $tz_output == 'user') OR ($_SESSION['wwm']['sett']['tzdiff'] <= 0 AND $tz_output == 'local') ) ? 'sub' : 'add';
            $offset = ['math' => $calc, 'diff' => abs($offset)];
            $date->$offset['math']( new DateInterval('PT'.$offset['diff'].'S') ); // php >= 5.3 use add() or sub()
        }
    }

    // create a individual output
    switch( $for ){
        case 'js':
            $format = 'm/d/Y H:i'; // Timepicker use only this format m/d/Y H:i without seconds // Sett automatical seconds default to 00
            break;
        case 'js:s':
            $format = 'm/d/Y H:i:s'; // Timepicker use only this format m/d/Y H:i:s with Seconds
            break;
        case 'db':
            $format = 'Y-m-d H:i:s'; // Database use only this format Y-m-d H:i:s
            break;
        case 'date':
        case 'datetime':
        case 'datetimes':
            $format = wwmSystem::$languages[$_SESSION['wwm']['sett']['isolang']][$for.'_format']; // language spezific output
            break;
        default:
            $format = $for;
            break;
    }

    $output = $date->format( $format );

    /** Replacement
     * 
     * D = day short name
     * l = day long name
     * F = month long name
     * M = month short name
     */
    $output = str_replace([
        $date->format('D'),
        $date->format('l'),
        $date->format('F'),
        $date->format('M')
    ],[
        $this->trans('date', $date->format('D')),
        $this->trans('date', $date->format('l')),
        $this->trans('date', $date->format('F')),
        $this->trans('date', $date->format('M'))
    ], $output);

    return $output; // $output->getTimestamp();
}

User · Answer

I think the best way would be using a SimpleDateFormat object   DateFormat sdf   new SimpleDateFormat  yyyy-MM-dd    String dateString    2014-02-11   Date dateObject   sdf parse dateString      Handle the ParseException here

User · Answer

Gotcha  passing 2 as month may give you unexpected result  in Calendar API  month is zero-based   2 actually means March   I don t know what is an  easy  way that you are looking for as I feel that using Calendar is already easy enough   Remember to use correct constants for month    Date date   new GregorianCalendar 2014  Calendar FEBRUARY  11  getTime        Another way is to make use of DateFormat  which I usually have a util like this    public static Date parseDate String date         try            return new SimpleDateFormat  yyyy-MM-dd   parse date          catch  ParseException e             return null               so that I can simply write   Date myDate   parseDate  2014-02-14        Yet another alternative I prefer  Don t use Java Date Calendar anymore   Switch to JODA Time or Java Time  aka JSR310  available in JDK 8     You can use LocalDate to represent a date  which can be easily created by   LocalDate myDate  LocalDate parse  2014-02-14       or LocalDate myDate2   new LocalDate 2014  2  14      or  in JDK 8  Time LocalDate myDate3   LocalDate of 2014  2  14

User · Answer

SimpleDateFormat sdf   new SimpleDateFormat  MMM dd yyyy HH mm ss   Locale ENGLISH     format as u want  try       String dateStart    June 14 2018 16 02 37       cal setTime sdf parse dateStart          all done   catch  ParseException e        e printStackTrace

User · Answer

tl dr LocalDate of  2014   2   11    If you insist on using the terrible old java util Date class  convert from the modern java time classes  java util Date                           Terrible old legacy class  avoid using  Represents a moment in UTC    from                                    New conversion method added to old classes for converting between legacy classes and modern classes      LocalDate                            Represents a date-only value  without time-of-day and without time zone       of  2014   2   11                   Specify year-month-day  Notice sane counting  unlike legacy classes  2014 means year 2014  1-12 for Jan-Dec       atStartOfDay                        Let java time determine first moment of the day  May  not  start at 00 00 00 because of anomalies such as Daylight Saving Time  DST           ZoneId of   quot Africa Tunis quot         Specify time zone as  Continent Region   never the 3-4 letter pseudo-zones like  PST    EST   or  IST                                             Returns a  ZonedDateTime        toInstant                           Adjust from zone to UTC  Returns a  Instant  object  always in UTC by definition                                           Returns a legacy  java util Date  object  Beware of possible data-loss as any microseconds or nanoseconds in the  Instant  are truncated to milliseconds in this  Date  object      Details If you want  quot easy quot   you should be using the new java time package in Java 8 rather than the notoriously troublesome java util Date  amp   Calendar classes bundled with Java  java time The java time framework built into Java 8 and later supplants the troublesome old java util Date  Calendar classes  Date-only  A LocalDate class is offered by java time to represent a date-only value without any time-of-day or time zone  You do need a time zone to determine a date  as a new day dawns earlier in Paris than in Montr  al for example  The ZoneId class is for time zones  ZoneId zoneId   ZoneId of   quot Asia Singapore quot     LocalDate today   LocalDate now  zoneId     Dump to console  System out println    quot today   quot    today    quot  in zone   quot    zoneId      today  2015-11-26 in zone  Asia Singapore  Or use a factory method to specify the year  month  day  LocalDate localDate   LocalDate of  2014   Month FEBRUARY   11      localDate  2014-02-11  Or pass a month number 1-12 rather than a DayOfWeek enum object  LocalDate localDate   LocalDate of  2014   2   11     Time zone  A LocalDate has no real meaning until you adjust it into a time zone  In java time  we apply a time zone to generate a ZonedDateTime object  That also means a time-of-day  but what time  Usually makes sense to go with first moment of the day  You might think that means the time 00 00 00 000  but not always true because of Daylight Saving Time  DST  and perhaps other anomalies  Instead of assuming that time  we ask java time to determine the first moment of the day by calling atStartOfDay  Specify a proper time zone name in the format of continent region  such as America Montreal  Africa Casablanca  or Pacific Auckland  Never use the 3-4 letter abbreviation such as EST or IST as they are not true time zones  not standardized  and not even unique     ZoneId zoneId   ZoneId of   quot Asia Singapore quot     ZonedDateTime zdt   localDate atStartOfDay  zoneId      zdt  2014-02-11T00 00 08 00 Asia Singapore   UTC  For back-end work  business logic  database  data storage  amp  exchange  we usually use UTC time zone  In java time  the Instant class represents a moment on the timeline in UTC  An Instant object can be extracted from a ZonedDateTime by calling toInstant  Instant instant   zdt toInstant      instant  2014-02-10T16 00 00Z  Convert You should avoid using java util Date class entirely  But if you must interoperate with old code not yet updated for java time  you can convert back-and-forth  Look to new conversion methods added to the old classes  java util Date d   java util from  instant         and    Instant instant   d toInstant         About java time The java time framework is built into Java 8 and later  These classes supplant the troublesome old legacy date-time classes such as java util Date  Calendar   amp  SimpleDateFormat  To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310  The Joda-Time project  now in maintenance mode  advises migration to the java time classes  You may exchange java time objects directly with your database  Use a JDBC driver compliant with JDBC 4 2 or later  No need for strings  no need for java sql   classes  Hibernate 5  amp  JPA 2 2 support java time  Where to obtain the java time classes   Java SE 8  Java SE 9  Java SE 10  Java SE 11  and later  - Part of the standard Java API with a bundled implementation   Java 9 brought some minor features and fixes    Java SE 6 and Java SE 7  Most of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport    Android  Later versions of Android  26   bundle implementations of the java time classes  For earlier Android   lt 26   a process known as API desugaring brings a subset of the java time functionality not originally built into Android   If the desugaring does not offer what you need  the ThreeTenABP project adapts ThreeTen-Backport  mentioned above  to Android  See How to use ThreeTenABP           UPDATE  The Joda-Time library is now in maintenance mode  and advises migration to the java time classes  I am leaving this section in place for history  Joda-Time For one thing  Joda-Time uses sensible numbering so February is 2 not 1  Another thing  a Joda-Time DateTime truly knows its assigned time zone unlike a java util Date which seems to have time zone but does not  And don t forget the time zone  Otherwise you ll be getting the JVM   s default  DateTimeZone timeZone   DateTimeZone forID   quot Asia Singapore quot     DateTime dateTimeSingapore   new DateTime  2014  2  11  0  0  timeZone    DateTime dateTimeUtc   dateTimeSingapore withZone  DateTimeZone UTC     java util Locale locale   new java util Locale   quot ms quot    quot SG quot        Language  Bahasa Melayu      Country  Singapore  String output   DateTimeFormat forStyle   quot FF quot    withLocale  locale   print  dateTimeSingapore     Dump to console    System out println   quot dateTimeSingapore   quot    dateTimeSingapore    System out println   quot dateTimeUtc   quot    dateTimeUtc    System out println   quot output   quot    output     When run    dateTimeSingapore  2014-02-11T00 00 00 000 08 00 dateTimeUtc  2014-02-10T16 00 00 000Z output  Selasa  2014 Februari 11 00 00 00 SGT  Conversion If you need to convert to a java util Date for use with other classes    java util Date date   dateTimeSingapore toDate

User · Answer

import java io    import java util    import java util HashMap   public class Solution         public static void main String   args                HashMap lt Integer String gt  hm   new HashMap lt Integer String gt             hm put 1  SUNDAY            hm put 2  MONDAY            hm put 3  TUESDAY            hm put 4  WEDNESDAY            hm put 5  THURSDAY            hm put 6  FRIDAY            hm put 7  SATURDAY            Scanner in   new Scanner System in           String month   in next            String day   in next            String year   in next             String format   year         month         day          Date date   null          try                       SimpleDateFormat formatter   new SimpleDateFormat  yyyy MM dd                date   formatter parse format                     catch Exception e                     Calendar c   Calendar getInstance            c setTime date           int dayOfWeek   c get Calendar DAY OF WEEK           System out println hm get dayOfWeek

User · Answer

Try this       Calendar cal   Calendar getInstance        Date todayDate   new Date        cal setTime todayDate           Set time fields to zero     cal set Calendar HOUR OF DAY  0       cal set Calendar MINUTE  0       cal set Calendar SECOND  0       cal set Calendar MILLISECOND  0       todayDate   cal getTime

User · Answer

Simplest ways   Date date   Date valueOf  2000-1-1    LocalDate localdate   LocalDate of 2000 1 1   LocalDateTime localDateTime   LocalDateTime of 2000 1 1 0 0

User · Answer

From Java8    import java time Instant  import java util Date   Date date   Date from Instant parse  2000-01-01T00 00 00 000Z

[java] How create Date Object with values in java

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