get commits since a date time in graphql

gistfile1.txt

let { repository } = await graphql(`{
    repository(owner: "${owner}", name:"${repoName}") {
        object(expression: "${branch}") {
            ... on Commit {
                history(first: 100, since: "${since}") {
                    nodes {
                        ${commitFields}
                    }
                }
            }
        }
    }
}`);

Where:

const commitFields = `
    id,
    oid,
    messageHeadline,
    message,
    committedDate,
    authoredDate,
    pushedDate,
    author {
        name,
        email,
        user {
            login
        }
    },
    history(first: 0) {
        totalCount
    }
`;

And:

let since = '2019-07-09T18:32:01Z' //a 'committedDate' from the repo