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 ()

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e5f345-44f9c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e5f345-44f9c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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