Need to get current timestamp in Java

Question

I need to get the current timestamp in Java  with the format of MM DD YYYY h mm ss AM PM    For example  06 01 2000 10 01 50 AM  I need it to be Threadsafe as well   Can I utilize something like this   java util Date date   new java util Date    System out println new Timestamp date getTime        Or the examples discussed at the link here

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You can make use of java util Date with direct date string format   String timeStamp   new SimpleDateFormat  yyyy MM dd HH mm ss   format new Date

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Try this single line solution    import java util Date  String timestamp        new java text SimpleDateFormat  MM dd yyyy h mm ss a   format new Date

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String format   0 dddd  MMMM d  yyyy hh mm tt    dt

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java time  As of Java 8  you can use the java time package  Specifically  use DateTimeFormatterBuilder and DateTimeFormatter to format the patterns and literals   DateTimeFormatter formatter   new DateTimeFormatterBuilder            appendPattern  MM   appendLiteral               appendPattern  dd   appendLiteral               appendPattern  yyyy   appendLiteral               appendPattern  hh   appendLiteral               appendPattern  mm   appendLiteral               appendPattern  ss   appendLiteral               appendPattern  a            toFormatter    System out println LocalDateTime now   format formatter      The output      06 22 2015 11 59 14 AM   Or if you want different time zone        system default System out println formatter withZone ZoneId systemDefault    format Instant now         Chicago System out println formatter withZone ZoneId of  America Chicago    format Instant now         Kathmandu System out println formatter withZone ZoneId of  Asia Kathmandu    format Instant now        The output      06 22 2015 12 38 42 PM 06 22 2015 02 08 42 AM 06 22 2015 12 53 42 PM

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well sometimes this is also useful   import java util Date  public class DisplayDate   public static void main String args            Instantiate an object    Date date   new Date           display time and date    System out println date toString         sample output  Mon Jul 03 19 07 15 IST 2017

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Joda-Time  Here is the same kind of code but using the third-party library Joda-Time 2 3    In real life  I would specify a time zone  as relying on default zone is usually a bad practice  But omitted here for simplicity of example   org joda time DateTime now   new DateTime    org joda time format DateTimeFormatter formatter   DateTimeFormat forPattern   MM dd yyyy h mm ss a     String nowAsString   formatter print  now     System out println   nowAsString      nowAsString      When run     nowAsString  11 28 2013 11 28 15 PM

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I did it like this when I wanted a tmiestamp      String timeStamp   new SimpleDateFormat  yyyyMMddHHmmss   format Calendar getInstance   getTime       Hope it helps    As a newbie I think it s self-explanatory  I think you also need import java text SimpleDateFormat  header for it to work

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Print a Timestamp in java  using the java sql Timestamp   import java sql Timestamp  import java util Date   public class GetCurrentTimeStamp       public static void main  String   args            java util Date date  new java util Date            System out println new Timestamp date getTime                This prints   2014-08-07 17 34 16 664   Print a Timestamp in Java using SimpleDateFormat on a one-liner   import java util Date  import java text SimpleDateFormat   class Runner      public static void main String   args            System out println              new SimpleDateFormat  MM dd yyyy HH mm ss   format new Date                  Prints   08 14 2014 14 10 38   Java date format legend   G Era designation      Text               AD y Year                 Year               1996  96 M Month in year        Month              July  Jul  07 w Week in year         Number             27 W Week in month        Number             2 D Day in year          Number             189 d Day in month         Number             10 F Day of week in month Number             2 E Day in week          Text               Tuesday  Tue a Am pm marker         Text               PM H Hour in day  0-23    Number             0 k Hour in day  1-24    Number             24 K Hour in am pm  0-11  Number             0 h Hour in am pm  1-12  Number             12 m Minute in hour       Number             30 s Second in minute     Number             55 S Millisecond          Number             978 z Time zone            General time zone  Pacific Standard Time  PST  GMT-08 00 Z Time zone            RFC 822 time zone  -0800

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The threadunsafety of SimpleDateFormat should not be an issue if you just create it inside the very same method block as you use it  In other words  you are not assigning it as static or instance variable of a class and reusing it in one or more methods which can be invoked by multiple threads  Only this way the threadunsafety of SimpleDateFormat will be exposed  You can however safely reuse the same SimpleDateFormat instance within the very same method block as it would be accessed by the current thread only   Also  the java sql Timestamp class which you re using there should not be abused as it s specific to the JDBC API in order to be able to store or retrieve a TIMESTAMP DATETIME column type in a SQL database and convert it from to java util Date   So  this should do   Date date   new Date    SimpleDateFormat sdf   new SimpleDateFormat  MM dd yyyy h mm ss a    String formattedDate   sdf format date   System out println formattedDate      12 01 2011 4 48 16 PM

User · Answer

The fact that SimpleDateFormat is not thread-safe does not mean you cannot use it  What that only means is that you must not use a single  potentially  but not necessarily static  instance that gets accessed from several threads at once   Instead  just make sure you create a fresh SimpleDateFormat for each thread  Instances created as local variables inside a method are safe by definition  because they cannot be reached from any concurrent threads   You might want to take a look at the ThreadLocal class  although I would recommend to just create a new instance wherever you need one  You can  of course  have the format definition defined as a static final String DATE FORMAT PATTERN          somewhere and use that for each new instance

[java] Need to get current timestamp in Java

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