Avoid the Date object creation w/ System.currentTimeMillis(). A divide by 1000 gets you to Unix epoch.
As mentioned in a comment, you typically want a primitive long (lower-case-l long) not a boxed object long (capital-L Long) for the unixTime variable's type.
long unixTime = System.currentTimeMillis() / 1000L;
Avoid the Date object creation w/ System.currentTimeMillis(). A divide by 1000 gets you to Unix epoch.
As mentioned in a comment, you typically want a primitive long (lower-case-l long) not a boxed object long (capital-L Long) for the unixTime variable's type.
long unixTime = System.currentTimeMillis() / 1000L;
Java 8 added a new API for working with dates and times. With Java 8 you can use
import java.time.Instant
...
long unixTimestamp = Instant.now().getEpochSecond();
Instant.now() returns an Instant that represents the current system time. With getEpochSecond() you get the epoch seconds (unix time) from the Instant.
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For 1280512800, multiply by 1000, since java is expecting milliseconds:
java.util.Date time=new java.util.Date((long)timeStamp*1000);
If you already had milliseconds, then just new java.util.Date((long)timeStamp);
From the documentation:
Allocates a Date object and initializes it to represent the specified number of milliseconds since the standard base time known as "the epoch", namely January 1, 1970, 00:00:00 GMT.
java.time.Instant.ofEpochSecond
Java 8 introduced a new API for working with dates and times: the java.time package.
With java.time you can parse your count of whole seconds since the epoch reference of first moment of 1970 in UTC, 1970-01-01T00:00Z. The result is an Instant.
Instant instant = Instant.ofEpochSecond( timeStamp );
If you need a java.util.Date to interoperate with old code not yet updated for java.time, convert. Call new conversion methods added to the old classes.
Date date = Date.from( instant );
Hi, just started to learn Clojure a couple of weeks ago. Now working on parsing some data, and I got stuck trying to convert epoch time. I'm using java-time for time operations, but it doesn't seem to have any functions to handle a timestamp like this 1612605265.
First get the date object, then get the time in millisecond(millseconds after 01/01/1970 00:00:00), in the end, divide the milliseconds by 1000 to get the seconds, which is UNIX time. You are done.
e.g.
String dateString = "Fri, 09 Nov 2012 23:40:18 GMT";
DateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy hh:mm:ss z");
Date date = dateFormat.parse(dateString );
long unixTime = (long) date.getTime()/1000;
System.out.println(unixTime );//<- prints 1352504418
Date.getTime provides 'number of milliseconds since January 1, 1970, 00:00:00' which is the same as Unix time * 1000.
getTime() retrieves the milliseconds since Jan 1, 1970 GMT passed to the constructor. It should not be too hard to get the Unix time (same, but in seconds) from that.
To get a timestamp from Date(), you'll need to divide getTime() by 1000, i.e. :
Date currentDate = new Date();
currentDate.getTime() / 1000;
// 1397132691
or simply:
long unixTime = System.currentTimeMillis() / 1000L;