Database
[{"_id":1,"station":"a","startTime":1592966066060,"endTime":1592966101344},{"_id":2,"station":"b","startTime":1595658195000,"endTime":1595658195000}]
Query
db.collection.aggregate([{$addFields:{startTimeDate:{$toDate:"$startTime"},endTimeDate:{$toDate:"$endTime"}}},{$match:{startTimeDate:{$gte:ISODate("2020-01-20T21:20:00Z")}}}])