How to get an updated time

input:
{
repository(owner: "MuYunyun", name: "blog") {
ref(qualifiedName: "refs/heads/master") {
target {
... on Commit {
history(first: 1, path: "package.json") {
edges {
node {
committedDate
}
}
}
}
}
}
}
}
return:
{
"data": {
"repository": {
"ref": {
"target": {
"history": {
"edges": [
{
"node": {
"committedDate": "2020-06-12T10:53:12Z"
}
}
]
}
}
}
}
}
}