Convert java util date default format to Timestamp in Java

Question

The default format of java util date is something like this  Mon May 27 11 46 15 IST 2013   How can I convert this into timestamp and calculate in seconds the difference between the same and current time   java util Date date  new java util Date    Timestamp ts now   new Timestamp date getTime       The above code gives me the current timestamp  However  I got no clue how to find the timestamp of the above string

User · Answer

You can use DateFormat java text    to parse the date   DateFormat df   new SimpleDateFormat  EEE MMM dd kk mm ss z yyyy   Locale ENGLISH   Date d   df parse  Mon May 27 11 46 15 IST 2013     You will have to change the locale to match your own  with this you will get 10 46 15   Then you can use the same code you have to convert it to a timestamp

User · Answer

java time  I am providing the modern answer  The Timestamp class was always poorly designed  a real hack on top of the already poorly designed Date class  Both those classes are now long outdated  Don   t use them   When the question was asked  you would need a Timestamp for sending a point in time to the SQL database  Since JDBC 4 2 that is no longer the case  Assuming your database needs a timestamp with time zone  recommended for true timestamps   pass it an OffsetDateTime   Before we can do that we need to overcome a real trouble with your sample string  Mon May 27 11 46 15 IST 2013  the time zone abbreviation  IST may mean Irish Summer Time  Israel Standard Time or India Standard Time  I have even read that Java may parse it into Atlantic Reykjavik time zone     Icelandic Standard Time   To control the interpretation we pass our preferred time zone to the formatter that we are using for parsing       DateTimeFormatter formatter   new DateTimeFormatterBuilder                appendPattern  EEE MMM dd HH mm ss                 appendZoneText TextStyle SHORT  Set of ZoneId of  Asia Kolkata                  appendPattern   yyyy                toFormatter Locale ROOT       String dateString    Mon May 27 11 46 15 IST 2013       OffsetDateTime dateTime   formatter parse dateString  Instant  from               atOffset ZoneOffset UTC       System out println dateTime     This snippet prints      2013-05-27T06 16 15Z   This is the UTC equivalent of your string  assuming IST was for India Standard Time   Pass the OffsetDateTime to your database using one of the PreparedStatement setObject methods  not setTimestamp       How can I convert this into timestamp and calculate in seconds the   difference between the same and current time    Calculating the difference in seconds goes very naturally with java time       long differenceInSeconds   ChronoUnit SECONDS              between dateTime  OffsetDateTime now ZoneOffset UTC        System out println differenceInSeconds     When running just now I got      202213260   Link  Oracle tutorial  Date Time explaining how to use java time

User · Answer

You can use the Calendar class to convert Date  public long getDifference         SimpleDateFormat sdf   new SimpleDateFormat  EEE MMM dd kk mm ss z yyyy        Date d   sdf parse  Mon May 27 11 46 15 IST 2013         Calendar c   Calendar getInstance        c setTime d       long time   c getTimeInMillis        long curr   System currentTimeMillis        long diff   curr - time       Time difference in milliseconds     return diff 1000

User · Answer

You can use    long startTime   date getTime     1000000     long estimatedTime   System nanoTime   - startTime    To get time in nano   Java Docs

User · Answer

Best one   String str date month  -  day  -  yr  DateFormat formatter   new SimpleDateFormat  MM-dd-yyyy    Date date    Date formatter parse str date    long output date getTime   1000L  String str Long toString output   long timestamp   Long parseLong str    1000

[java] Convert java.util.date default format to Timestamp in Java

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