datetime datatype in java

Question

Which data type can I use in Java to hold the current date as well as time   I want to store the datetime in a db as well as having a field in the java bean to hold that   is it java util Date

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Since Java 8  it seems like the java time standard library is the way to go  From Joda time web page      Note that from Java SE 8 onwards  users are asked to migrate to java time  JSR-310  - a core part of the JDK which replaces this project      Back to your question  Were you to use Java 8  I think you want LocalDateTime  Because it contains the date and time-of-the-day  but is unaware of time zone or any reference point in time such as the unix epoch

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java util Date represents an instant in time  with no reference to a particular time zone or calendar system  It does hold both date and time though - it s basically a number of milliseconds since the Unix epoch   Alternatively you can use java util Calendar which does know about both of those things   Personally I would strongly recommend you use Joda Time which is a much richer date time API  It allows you to express your data much more clearly  with types for  just dates    just local times    local date time    instant    date time with time zone  etc  Most of the types are also immutable  which is a huge benefit in terms of code clarity

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java time  The java time framework built into Java 8 and later supplants both the old date-time classes bundled with the earliest versions of Java and the Joda-Time library  The java time classes have been back-ported to Java 6  amp  7 and to Android   The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds    Instant instant   Instant now      Apply an offset-from-UTC  a number of hours and possible minutes and seconds  to get an OffsetDateTime   ZoneOffset offset   ZoneOffset of   -04 00     OffsetDateTime odt   OffsetDateTime ofInstant  instant   offset      Better yet is applying a full time zone which is an offset plus a set of rules for handling anomalies such as Daylight Saving Time  DST    ZoneId zoneId   ZoneId of   America Montreal     ZonedDateTime zdt   ZonedDateTime ofInstant  instant   zoneId      Database  Hopefully the JDBC drivers will be updated to work directly with the java time classes  Until then we must use the java sql classes to move date-time values to from the database  But limit your use of the java sql classes to the chore of database transit  Do not use them for business logic  As part of the old date-time classes they are poorly designed  confusing  and troublesome   Use new methods added to the old classes to convert to from java time  Look for to    and valueOf methods   Use the java sql Timestamp class for date-time values    java sql Timestamp ts   java sql Timestamp valueOf  instant      And going the other direction     Instant instant   ts toInstant      For date-time data you virtually always want the TIMESTAMP WITH TIME ZONE data type rather than WITHOUT when designing your table columns in your database

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import java util Date  import java text DateFormat  import java text SimpleDateFormat   private String getDateTime         DateFormat dateFormat   new SimpleDateFormat  yyyy MM dd HH mm ss        Date date   new Date        return dateFormat format date

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You can use Calendar        Calendar rightNow   Calendar getInstance      Calendar    Date4j alternative to Date  Calendar  and related Java classes

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Depends on the RDBMS or even the JDBC driver    Most of the times you can use java sql Timestamp most of the times along with a prepared statement    pstmt setTimestamp  index  new Timestamp  yourJavaUtilDateInstance getTime

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I used this import   import java util Date    And declared my variable like this    Date studentEnrollementDate

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1 the recommendation for Joda-time   If you plan on doing anything more than a simple Hello World example  I suggest reading this   Daylight saving time and time zone best practices

[java] datetime datatype in java

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