Github GraphQL API for popular discussions

Question

I need to find top 5 popular discussions in the last month for a Github repo. By popular, I mean most interacted with. I am using the below java-script code which gives me the total count of comments and reactions for each discussion. But how do I modify it get the total count of comments and reactions in the last month? I am new to GraphQL, so if someone has a better idea to achieve this, please help.

function get_repo_discussions(repo) {
  var after = "";
  var res = [];
  do {
    var query = ` \
    query { \
      repository(owner: ` + '"' + owner + '", name: "' + repo + `") { \
        discussions(first:100 \
        ` + after + `\
         ) { \
          totalCount \
          pageInfo { \
            startCursor \
            endCursor \
            hasNextPage \
            hasPreviousPage \
          } \
          edges { \
            node { \
              number, title, url, createdAt \
              comments { 
                totalCount \  
              }, \
              reactions { 
                totalCount \
                } \
            } \
          } \
        } \
      } \
    } \
      `;
    var ql = 'https://api.github.com/graphql';
    var response = UrlFetchApp.fetch(ql, {
      method: "POST",
      contentType: 'application/json', 
      headers: { Authorization: 'Bearer ' + token},
      payload: JSON.stringify({query: query})
      });
    var json = response.getContentText();
    data = JSON.parse(json);
    // Logger.log(data.data.repository.discussions.pageInfo.hasNextPage);
    var discussion_count = data.data.repository.discussions.edges.length;
    var edges = data.data.repository.discussions.edges;
    for (var i = 0; i < discussion_count;i++){
      var node = edges[i].node;
      var number = node.number;
      var title = node.title;
      var url = node.url;
      var created_at = new Date(node.createdAt);
      var comments = node.comments.totalCount;
      var reactions = node.reactions.totalCount;
      res.push([number,title, url, created_at,comments + reactions]);
    }
    if(data.data.repository.discussions.pageInfo.hasNextPage){
      after = " after:" + '"' + data.data.repository.discussions.pageInfo.hasNextPage.endCursor + '"';
    }
  }   
  while(data.data.repository.discussions.pageInfo.hasNextPage ==true);
  return res;
}