javascript - Query on date for posts created the last 24h -

i have schema date field "created_at":

var post = new mongoose.schema({     text : string,     created_at : {type : date, index : true},     pos : {latitude: number, longitude: number},     created_by : {type : schema.types.objectid, ref : "userschema"} }); 

with this:

post.pre("save", function (next){     var currentdate = new date();      if(!this.created_at)     {         this.created_at = currentdate;     }     next(); }); 

now want post created last 24h, how can query ?

to posts created in last 24hrs, current time, subtract 24 hours , value of start date use in date range query:

var start = new date(new date().gettime() - (24 * 60 * 60 * 1000));  post.find({ "created_at": { "$gte": start } }).exec(callback); 

if want know more $gte, check following article:

https://docs.mongodb.org/manual/reference/operator/query/gte/

---

with momentjs library can simply

var start = moment().subtract(24, 'hours').todate(); post.find({ "created_at": { "$gte": start } }).exec(callback); 

you define date default function instead of pre hook middleware:

var post = new mongoose.schema({     text : string,     created_at : {type : date, default: date.now, index : true},     pos : {latitude: number, longitude: number},     created_by : {type : schema.types.objectid, ref : "userschema"} });