Time series tick

[Shawn]

Hi,

I am using JFreechart to draw a daily time series
chart. Why the data point is not consistent with the
horizontal date tick. There seems several hours lag
between these two. Any one knows the reason?

Thanks

[Rich]

Hi,

I have the same problem. Can someone shed light on it? Thanks.

Rich

[David Gilbert]

It's most likely the problem with the getStart() and getEnd() methods in the TimePeriod subclasses not taking into account the time zone. There's no fix for this yet...

Regards,

Dave Gilbert

[Anthony Berglas]

Yes, I found that -- a Day is a GMT day!

Try using Millisecond instead of Minute etc. It is processed differently. That said, my next post contains a problem.

Anthony

[Dean Michaels]

The amount of "drift" is double your local timezone offset from GMT.

It appears that it is a bug with com.jrefinery.data.TimeSeriesCollection.

/**
* Calculates the offset (in milliseconds) of the default time zone from GMT.
*/
private int calculateZoneOffset(Date time) {

TimeZone zone = TimeZone.getDefault();
int result = zone.getRawOffset();
if (zone.inDaylightTime(time)) {
result += 60*60*1000;
}
// return result; // the offset it the wrong way.
return (0-result) ; // return the negative value instead

}


This cleaned it up for me

[Dean Michaels]

Damn, tabs don't work in this phorum.