Find posts that are older than current date in MongoDB?

To find posts older than current date in MongoDB, use $lte. Let us create a collection with documents −

> db.demo746.insertOne({DueDate:new Date("2020-01-10")});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5eae67eca930c785c834e55b")
}
> db.demo746.insertOne({DueDate:new Date("2020-10-10")});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5eae67eda930c785c834e55c")
}
> db.demo746.insertOne({DueDate:new Date("2020-03-05")});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5eae67eea930c785c834e55d")
}
> db.demo746.insertOne({DueDate:new Date("2020-05-04")});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5eae67f1a930c785c834e55e")
}

Display all documents from a collection with the help of find() method −

> db.demo746.find();

This will produce the following output −

{ "_id" : ObjectId("5eae67eca930c785c834e55b"), "DueDate" : ISODate("2020-01-10T00:00:00Z") }
{ "_id" : ObjectId("5eae67eda930c785c834e55c"), "DueDate" : ISODate("2020-10-10T00:00:00Z") }
{ "_id" : ObjectId("5eae67eea930c785c834e55d"), "DueDate" : ISODate("2020-03-05T00:00:00Z") }
{ "_id" : ObjectId("5eae67f1a930c785c834e55e"), "DueDate" : ISODate("2020-05-04T00:00:00Z") }

Following is the query to find posts older than the current date −

> db.demo746.find({DueDate:{$lte:new Date()}});

This will produce the following output −

"_id" : ObjectId("5eae67eca930c785c834e55b"), "DueDate" : ISODate("2020-01-10T00:00:00Z") }
{ "_id" : ObjectId("5eae67eea930c785c834e55d"), "DueDate" : ISODate("2020-03-05T00:00:00Z") }