Which SchemaType in Mongoose is Best for Timestamp?

Edit - 20 March 2016

Mongoose now support timestamps for collections.

Please consider the answer of @bobbyz below. Maybe this is what you are looking for.

Original answer

Mongoose supports a Date type (which is basically a timestamp):

time : { type : Date, default: Date.now }

With the above field definition, any time you save a document with an unset time field, Mongoose will fill in this field with the current time.

Source: http://mongoosejs.com/docs/guide.html

The current version of Mongoose (v4.x) has time stamping as a built-in option to a schema:

var mySchema = new mongoose.Schema( {name: String}, {timestamps: true} );

This option adds createdAt and updatedAt properties that are timestamped with a Date, and which does all the work for you. Any time you update the document, it updates the updatedAt property. Schema Timestamps Docs.