$ mongoexport  -h xx.xx.xx.xx  \
  --port=27017  \
  --username=username \
  --password='XXX' \
  --authenticationDatabase=admin  \
  -d  test \
  -c T_Test \
  -q '{"$and":[{"sendTime":{"$gt": new Date(1598889600000)}},{"sendTime":{"$lt": new Date(1601481600000)}}]}' \
  --type json \
  -o T_Test.json

$ mongoexport   -h xx.xx.xx.xx  --port=27017  --username=username --password='XXX'  --authenticationDatabase=admin  \
  -d test  \
  -c T_Test  \
  -q '{"appId" : "500000009", sendTime: {$gt: ISODate("2021-10-01T00:00:00Z"),$lt: ISODate("2021-11-01T00:00:00Z")}}'   \
  -f _id,sourceId,senderId,appId,content,url,title,headImg,sendTime,pubId,acceptId,eid,later,dealTime,deal,oneKey,todoType,level \
  --type csv  \
  -o T_Test.csv

$ mongo  --host xx.xx.xx.xx:27017  --username=username  --password='password'  --authenticationDatabase=admin

> db.T_Test.count({"$and":[{"day":{"$gte": ISODate("2020-12-31T16:00:00.000Z")}},{"day":{"$lte": ISODate("2021-07-30T15:59:59.999Z")}}]})

参考

MongoDB find()方法：查询数据
http://c.biancheng.net/view/6555.html

MongoDB 条件操作符 gt、gte、lt、lte
https://blog.csdn.net/qq_43472877/article/details/110823207