@Override
public void handle(CellVisitorContext context) {
short srcFormat = context.getFormatIndex();
DataFormat dataFormat = context.getBook().createDataFormat();
short dstFormat = dataFormat.getFormat(format);
if (srcFormat != dstFormat) {
CellStyle newStyle = context.cloneCellStyle();
newStyle.setDataFormat(dstFormat);
context.getRange().setStyle(newStyle);