append a file name with timestamp

[Gopu Akraju]

I am trying to append a file name with time stamp so that every file will have a unique file name. I tried as below:

String outFileName = outDir + "\\"  + (new java.sql.Date(today.getTime())) + ".txt";

This works fine as the file name gets appended with 2008-04-07.txt Now I want to add timestamp with it to make it unique. I tried as below:

new java.sql.Timestamp(System.currentTimeMillis());

It is throwing error.
When I try to print the above piece of code, it prints as below:

2008-04-07 10:45:19.942

But it is not allowing me to write a file as with that name filename_2008-04-07 10:48:05.083.txt (The parameter is incorrect) Is it due to the gap between date and time stamp. How do I overcome this? Thanks.

[Christophe Verré]

Are you using Windows ? In Windows Explorer, try to create a file whose name is the filename you have posted above. What does it say ?

[Gopu Akraju]

Thanks for your response. I could finish it as below:

String end = getDate()+ "_" + getTime();
 
  private  final static String getDate(  )   {
        DateFormat df = new SimpleDateFormat( "yyyy-MM-dd" ) ;
        df.setTimeZone( TimeZone.getTimeZone( "PST" )  ) ;
        return ( df.format( new Date(  )  )  ) ;
    }
 private  final static String getTime(  )   {
        DateFormat df = new SimpleDateFormat( "hh-mm-ss" ) ;
        //df.setTimeZone ( TimeZone.getTimeZone ( "PST" )  ) ;
        df.setTimeZone( TimeZone.getTimeZone( "Singapore" )  ) ;
        
        
        return ( df.format( new Date(  )  )  ) ;
    }

Now I could append the filename with date_time so that it each file name is unique.

[Rob Spoor]

Originally posted by Gopu Akraju:
Thanks for your response. I could finish it as below:

String end = getDate()+ "_" + getTime();
 
  private  final static String getDate(  )   {
        DateFormat df = new SimpleDateFormat( "yyyy-MM-dd" ) ;
        df.setTimeZone( TimeZone.getTimeZone( "PST" )  ) ;
        return ( df.format( new Date(  )  )  ) ;
    }
 private  final static String getTime(  )   {
        DateFormat df = new SimpleDateFormat( "hh-mm-ss" ) ;
        //df.setTimeZone ( TimeZone.getTimeZone ( "PST" )  ) ;
        df.setTimeZone( TimeZone.getTimeZone( "Singapore" )  ) ;
        
        
        return ( df.format( new Date(  )  )  ) ;
    }

Now I could append the filename with date_time so that it each file name is unique.

You can use one single method as well:

private  final static String getDateTime()
{
    DateFormat df = new SimpleDateFormat("yyyy-MM-dd_hh:mm:ss");
    df.setTimeZone(TimeZone.getTimeZone("PST"));
    return df.format(new Date());
}

It will be just a bit more efficient - only one SimpleDateFormat and Date object for each file, as well as no String concatenation.