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javaunix-timestampdatetime-conversion

Java Converting 19-digit Unix Timestamp to a Readable Date

I am trying to convert 19 digit Unix timestamp such as 1558439504711000000 (one and a half quintillion) into a readable date/time format. My timestamp ends with 6 zeros which suggests the time is in nano seconds.

I have come across some examples where people have used time zones which I don't need. Another example uses ofEpochSecond like so:

Instant instant = Instant.ofEpochSecond(seconds, nanos);

But I am not sure whether I need to use ofEpochSecond.

The code below gives my most recent approach of achieving this:

String timeStamp = "1558439504711000000";
long unixNanoSeconds = Long.parseLong(timeStamp);
Date date = new java.util.Date(timeStamp*1000L); 
// My preferred date format
SimpleDateFormat sdf = new java.text.SimpleDateFormat("dd-MM-yyyy HH:mm:ss");                    
String formattedDate = sdf.format(date);
System.out.println("The timestamp in your preferred format is: " +  formattedDate);

But the output I get is something like this: 

// The timestamp in your preferred format is: 11-12-49386951 11:43:20

Which does not show the year format in e.g. 2019 format.

Solution

  • Try using this

    Date date = new java.util.Date(timeStamp/1000000);

    Instead of multiplying by 1000, divide by 1000000