Why is the default:date.now invalid here?

const userSchema = new Schema({
  name:{type:String},
  clubnumber:{type:String},
  details:[{
    detail:{type:String,default:Date.now}
  }]
})

there is no loading time when looking at the database

Mar.30,2021

Date.now ()


mongoose bar: d
nodejs is Date.now ()

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