Hi,
Can you try this approach?
function time.beforeInit(sender, config)
{
config.increment=60;
}
function time.boxready(sender, width, height, eOpts)
{
this.getStore().data.items.forEach(function(dt) {
dt.data.date.setMinutes(59);
dt.data.disp = Ext.Date.format(dt.data.date, 'H:i:s');
});
}