Tired of not being able to get the time with a millisecond precision on windows?
Here is a ‘fix’. Works on 1.5+ only.
That was submitted (in a somewhat different and reduced version) as a RFE to Sun, today. /me crosses fingers…
note: also includes a nanosecond precise date, but which is not -of course- compatible with Date class and others.
/**
* DOCUMENT ME!
*
* @author pepe
*/
public class PreciseInternalDate
{
//~ Static fields/initializers *********************************************
/** DOCUMENT ME! */
static long lastDate;
/** DOCUMENT ME! */
static long lastDateNanos;
/** DOCUMENT ME! */
static long nanos;
static
{
lastDate = System.currentTimeMillis( );
nanos = System.nanoTime( );
lastDateNanos = lastDate * 1000000;
}
//~ Constructors ***********************************************************
/**
* Creates a new instance of PreciseInternalDate
*/
private PreciseInternalDate( ) {}
//~ Methods ****************************************************************
/**
* DOCUMENT ME!
*
* @return DOCUMENT ME!
*/
static public long currentTimeMillis( )
{
checkForClockReset( );
return lastDate + ( ( System.nanoTime( ) - nanos ) / 1000000 );
}
/**
* DOCUMENT ME!
*
* @return DOCUMENT ME!
*/
static public long currentTimeNanos( )
{
checkForClockReset( );
return lastDateNanos + ( System.nanoTime( ) - nanos );
}
/**
* DOCUMENT ME!
*/
static private void checkForClockReset( )
{
long newCurTime = System.currentTimeMillis( );
long predicted = lastDate + ( ( System.nanoTime( ) - nanos ) / 1000000 );
long delta = predicted - newCurTime;
if ( ( delta > 200 ) || ( delta < 0 ) ) // let's say that if there is a decal of over 200ms, the clock got reset and we need to change the date accordingly (could be the user changing date on his machine, or through nntp server)
{ // also, delta should only be positive, because predicted is of better precision than newCurtime. Otherwise, it might also be a clock reset.
lastDate = newCurTime;
lastDateNanos = newCurTime * 1000000;
}
}
}
Disclaimer: this code is not intended to be ran in a nuclear facility, nor it should run in a machine with an uptime greater than 292 years. 
