4 byte timestamp java
int dateInSec = (int) (System.currentTimeMillis() / 1000);
byte[] bytes = ByteBuffer.allocate(4).putInt(dateInSec).array();
Smiling Sandpiper
int dateInSec = (int) (System.currentTimeMillis() / 1000);
byte[] bytes = ByteBuffer.allocate(4).putInt(dateInSec).array();