select an entry each month using mongoose

I have a dictionary model like this:

const dictionarySchema = new Schema({
    entry: String,
    created: { type: Date, default: Date.now },
});

and I want to select this entry each month after its creation date.

How you do this ?

Something like this gives me the entries older than a month, but this is not what I want:

const conditions = { 
    created: { $lt: minusDays(new Date(), 30) },    
}
const dicEntry = await dbs['en'].Dictionary.find(conditions);

I want a solution to select the entry every 30 days from its creation date.