NodeJS MongoDB查找早于当前日期的帖子

Question

So I have this code line here:

let advertisements = await Advertisement.find({created_at: {$lt: moment().valueOf()}});

This is what it does:

created_at : returns a timestamp when post was created at: 1551198203488.0

moment.valueOf() return me a current timestamp for example: 1551198203488.0

Now I need to write this code line that it only finds ads that are 1 hour old. Is is possible somehow ?

Also I storing and group2_date which store current timestamp BUT with 1 hour added to it like this: moment().add(1, 'h')

Answer 1

You can subtract one hour from the moment using .subtract function and then use $gte operator to obtain only the greater values/documents from the subtracted hours and less then from the current time.

let advertisements = await Advertisement.find({
  "created_at": {
    "$lte": moment().toDate(),
    "$gte": moment().subtract(1, 'hours').toDate()
  }
})