火力地堡的查询时间戳
Query query = mFirestore.collection("rootcollection")
.orderBy("timestamp", Query.Direction.DESCENDING)
.whereEqualTo("month", 3);
firebase查询时间戳
Query query = mFirestore.collection("rootcollection")
.orderBy("timestamp", Query.Direction.DESCENDING)
.whereEqualTo("month", 3);