MongoDB query based on date plus time - mongodb

Question

i've to run a query like this (sql) in MongoDb 4:
SELECT * FROM log WHERE DATE_ADD(created_at, INTERVAL 2 HOUR) < NOW()
Basically, I want to find all the documents, in the PENDING state, whose creation date PLUS TWO HOURS is less than now .. Let me explain: I want to find all the documents in the PENDING state that have been in PENDING for more than two hours.
I feel stupid, but I am failing to do this with MongoDb.
I also created a playground:
https://mongoplayground.net/p/4bifqiX2KMJ
Can you help me?

Answer 1

You can add hours in ISO date using $add, convert string date to ISO date using dateFromString,
let date = new Date();
db.collection.find({
status: "pending",
$expr: {
$lt: [
{
$add: [
// convert string date to ISOdate, if its already then use only "$inserted_at"
{ $dateFromString: { dateString: "$inserted_at" } },
// add milliseconds
7200000 // (60*60*2000)
]
},
date
]
}
})
Playground
Or subtract from current date and then compare the condition,
let date = new Date();
date = new Date(date.getHours()-2); //subtract 2 hours
db.collection.find({
status: "pending",
$expr: {
$lt: [
{ $dateFromString: { dateString: "$inserted_at" } },
date
]
}
})
Playground