How to generate heat map for last one month from current date

I want the attendance of the employee profile dashboard for the last one month instead of one year. What can I do now?

Maybe give pointers to explain what you have found, done and tried?

To collaborate is ideal so all can learn along with you…

I want to display this dashboard attendance only one month last 30 days attendance show.

See also How to change Year to Month on Heatmap chart