중포 기지 타임스탬프 쿼리
Query query = mFirestore.collection("rootcollection")
.orderBy("timestamp", Query.Direction.DESCENDING)
.whereEqualTo("month", 3);
firebase 쿼리 타임스탬프
Query query = mFirestore.collection("rootcollection")
.orderBy("timestamp", Query.Direction.DESCENDING)
.whereEqualTo("month", 3);