Need to change the date format for timeline graph and found solution. Accordingly updated the 2 js file for the app and restarted the Splunk, but it was not reflected in the app. I get to know the app needs to be rebuild to take effect from a solution provided in Splunk.
But the real question is how to rebuild the app in windows?
In Linux we can use this "Build the visualization by running $ npm run build", how can we do the same in windows?