Mongo DB Exports

I want to export data from my mongoDB database to CSV files on a scheduled basis , the timestamp field in the tables is in unix format , so I want to export from the table every 2 hours so it needs to be able to change the value of the time criteria using a script then export the data and FTP it to another server , there will be about 7 exports for instance the query would be { "SiteId": NumberInt(203), "Date": { $gte: NumberLong(1532268000) } } To export all the data with a time stamp 2pm on 22/07/2018 Then it would change on the next run to { "SiteId": NumberInt(203), "Date": { $gte: NumberLong(1532275200) } } To export all the data with a time stamp 4pm on 22/07/2018 The scripts need to be run by the windows task manger