you can build it with license lib https://stackblitz.com/edit/react-gantt-basic?file=package.json
or modify the google gantt again by fork this repo https://github.com/Criccle/GoogleGantt/blob/master/src/GoogleGantt/widget/GoogleGantt.js
but i think the google gantt lib still not support format date , the issue still open https://github.com/google/google-visualization-issues/issues/2870
this option
hAxis: {
format: 'M/d/yy',
gridlines: {count: 15}
},
only work in line chart, but can not using in gantt chart