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Rowkey design question

I'm currently playing with hbase. The design of the rowkey seems to be

The rowkey for a certain database table of mine is:


It looks something like this when performing a scan on the table in the shell:
hbase(main):012:0> scan 'ToyDataTable'
ROW                                         COLUMN+CELL
 1357020000000+                column=CF:SampleCol,
timestamp=1361288601717, value=Entry_1 = 2013-01-01 07:00:00

Since I got several rows for different timestamps I'd like to tell a
scan to just a region of the table for example from 2013-01-07 to
2013-01-09. Previously I only had a timestamp as the rowkey and I
could restrict the rowkey like that:

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date startDate = formatter.parse("2013-01-07 07:00:00");
Date endDate = formatter.parse("2013-01-10 07:00:00");

HTableInterface toyDataTable = pool.getTable("ToyDataTable");
Scan scan = new Scan( Bytes.toBytes( startDate.getTime() ),
Bytes.toBytes( endDate.getTime() ) );

But this no longer works with my new design.

Is there a way to tell the scan object to filter the rows with respect
to the timestamp, or do I have to use a filter object?