Convert LocalDate to LocalDateTime or java sql Timestamp

Question

I am using JodaTime 1 6 2   I have a LocalDate that I need to convert to either a  Joda  LocalDateTime  or a java sqlTimestamp for ormapping   The reason for this is I have figured out how to convert between a LocalDateTime and a java sql Timestamp   LocalDateTime ldt   new LocalDateTime    DateTimeFormatter dtf   DateTimeFormatter forPattern  yyyy-MM-dd HH mm ss    Timestamp ts   Timestamp valueOf ldt toString dtf      So  if I can just convert between LocalDate and LocalDateTime  then I can make the continued conversion to java sql Timestamp  Thanks for any nudges in the right direction

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Since Joda is getting faded  someone might want to convert LocaltDate to LocalDateTime in Java 8  In Java 8 LocalDateTime it will give a way to create a LocalDateTime instance using a LocalDate and LocalTime  Check here      public static LocalDateTime of LocalDate date                                   LocalTime time    Sample would be          just to create a sample LocalDate     DateTimeFormatter dtf   DateTimeFormatter ofPattern  yyyyMMdd        LocalDate ld   LocalDate parse  20180306   dtf           convert ld into a LocalDateTime        We need to specify the LocalTime component here as well  it can be any accepted value     LocalDateTime ldt   LocalDateTime of ld  LocalTime of 0 0       2018-03-06T00 00   Just for reference  For getting the epoch seconds below can be used       ZoneId zoneId   ZoneId systemDefault        long epoch   ldt atZone zoneId  toEpochSecond             If you only care about UTC     long epochUTC   ldt toEpochSecond ZoneOffset UTC

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The best way use Java 8 time API     LocalDateTime ldt   timeStamp toLocalDateTime      Timestamp ts   Timestamp valueOf ldt     For use with JPA put in with your model  https   weblogs java net blog montanajava archive 2014 06 17 using-java-8-datetime-classes-jpa     Converter autoApply   true  public class LocalDateTimeConverter implements AttributeConverter lt LocalDateTime  Timestamp gt         Override     public Timestamp convertToDatabaseColumn LocalDateTime ldt            return Timestamp valueOf ldt               Override     public LocalDateTime convertToEntityAttribute Timestamp ts            return ts toLocalDateTime              So now it is relative timezone independent time  Additionally it is easy do     LocalDate ld   ldt toLocalDate      LocalTime lt   ldt toLocalTime      Formatting    DateTimeFormatter DATE TME FORMATTER   DateTimeFormatter ofPattern  yyyy-MM-dd HH mm    String str   ldt format DATE TME FORMATTER    ldt   LocalDateTime parse str  DATE TME FORMATTER     UPDATE  postgres 9 4 1208  HSQLDB 2 4 0 etc understand Java 8 Time API without any conversations

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function call asStartOfDay   on java time LocalDate object returns a java time LocalDateTime object

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JodaTime To convert JodaTime s org joda time LocalDate to java sql Timestamp  just do Timestamp timestamp   new Timestamp localDate toDateTimeAtStartOfDay   getMillis      To convert JodaTime s org joda time LocalDateTime to java sql Timestamp  just do Timestamp timestamp   new Timestamp localDateTime toDateTime   getMillis       JavaTime To convert Java8 s java time LocalDate to java sql Timestamp  just do Timestamp timestamp   Timestamp valueOf localDate atStartOfDay      To convert Java8 s java time LocalDateTime to java sql Timestamp  just do Timestamp timestamp   Timestamp valueOf localDateTime

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Depending on your timezone  you may lose a few minutes  1650-01-01 00 00 00 becomes 1649-12-31 23 52 58   Use the following code to avoid that  new Timestamp localDateTime getYear   - 1900  localDateTime getMonthOfYear   - 1  localDateTime getDayOfMonth    localDateTime getHourOfDay    localDateTime getMinuteOfHour    localDateTime getSecondOfMinute    fractional

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Java8    import java time Instant  Instant now   getEpochSecond      timestamp in seconds format  int  Instant now   toEpochMilli       timestamp in milliseconds format  long

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tl dr  The Joda-Time project is in maintenance-mode  now supplanted by java time classes    Just use java time Instant class  No need for    LocalDateTime java sql Timestamp Strings    Capture current moment in UTC   Instant now       To store that moment in database   myPreparedStatement setObject        Instant now         Writes an  Instant  to database    To retrieve that moment from datbase   myResultSet getObject        Instant class       Instantiates a  Instant    To adjust the wall-clock time to that of a particular time zone   instant atZone  z       Instantiates a  ZonedDateTime    LocalDateTime is the wrong class  Other Answers are correct  but they fail to point out that LocalDateTime is the wrong class for your purpose   In both java time and Joda-Time  a LocalDateTime purposely lacks any concept of time zone or offset-from-UTC  As such  it does not represent a moment  and is not a point on the timeline  A LocalDateTime represents a rough idea about potential moments along a range of about 26-27 hours    Use a LocalDateTime for either when the zone offset is unknown  not a good situation   or when the zone-offset is indeterminate  For example     Christmas starts at first moment of December 25  2018    would be represented as a LocalDateTime   Use a ZonedDateTime to represent a moment in a particular time zone  For example  Christmas starting in any particular zone such as Pacific Auckland or America Montreal would be represented with a ZonedDateTime object   For a moment always in UTC  use Instant   Instant instant   Instant now         Capture the current moment in UTC    Apply a time zone  Same moment  same point on the timeline  but viewed with a different wall-clock time   ZoneId z   ZoneId of   Africa Tunis      ZonedDateTime zdt   instant atZone  z         Same moment  different wall-clock time       So  if I can just convert between LocalDate and LocalDateTime    No  wrong strategy  If you have a date-only value  and you want a date-time value  you must specify a time-of-day  That time-of-day may not be valid on that date for a particular zone     in which case ZonedDateTime class automatically adjusts the time-of-day as needed   LocalDate ld   LocalDate of  2018   Month JANUARY   23     LocalTime lt   LocalTime of  14   0         14 00   2 PM  ZonedDateTime zdt   ZonedDateTime of  ld   lt   z       If you want the first moment of the day as your time-of-day  let java time determine that moment  Do not assume the day starts at 00 00 00  Anomalies such as Daylight Saving Time  DST  mean the day may start at another time such as 01 00 00   ZonedDateTime zdt   ld atStartOfDay  z       java sql Timestamp is the wrong class  The java sql Timestamp is part of the troublesome old date-time classes that are now legacy  supplanted entirely by the java time classes  That class was used to represent a moment in UTC with a resolution of nanoseconds  That purpose is now served with java time Instant   JDBC 4 2 with getObject setObject  As of JDBC 4 2 and later  your JDBC driver can directly exchange java time objects with the database by calling    PreparedStatement  setObject ResultSet  getObject   For example   myPreparedStatement setObject        instant           and      Instant instant   myResultSet getObject        Instant class       Convert legacy   modern  If you must interface with old code not yet updated to java time  convert back and forth using new methods added to the old classes   Instant instant   myJavaSqlTimestamp toInstant         Going from legacy class to modern class       and     java sql Timestamp myJavaSqlTimestamp   java sql Timestamp from  instant         Going from modern class to legacy class      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   The Joda-Time project  now in maintenance mode  advises migration to the java time classes   To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310   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   Where to obtain the java time classes     Java SE 8  Java SE 9  and later   Built-in   Part of the standard Java API with a bundled implementation  Java 9 adds some minor features and fixes   Java SE 6 and Java SE 7   Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   Later versions of Android bundle implementations of the java time classes  For earlier Android   lt 26   the ThreeTenABP project adapts ThreeTen-Backport  mentioned above   See How to use ThreeTenABP        The ThreeTen-Extra project extends java time with additional classes  This project is a proving ground for possible future additions to java time  You may find some useful classes here such as Interval  YearWeek  YearQuarter  and more

[java] Convert LocalDate to LocalDateTime or java.sql.Timestamp

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