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Date()¶

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Behavior
Examples

Date()¶

Returns a date either as a string or as a 日期 object.

Date() returns the current date as a string in the mongo shell.
new Date() returns the current date as a 日期 object. The mongo shell wraps the 日期 object with the ISODate helper. The ISODate is in UTC.

You can specify a particular date by passing to the Date() method a datetime string. For example:

new Date("<YYYY-mm-dd>") which returns the ISODate with the specified date.
new Date("<YYYY-mm-ddTHH:MM:ss>") which specifies the datetime in local datetime and returns the ISODate with the specified datetime in UTC.
new Date("<YYYY-mm-ddTHH:MM:ssZ>") which specifies the datetime in UTC and returns the ISODate with the specified datetime in UTC.

Behavior¶

Internally, 日期 objects are stored as a 64 bit integer representing the number of milliseconds since the Unix epoch (Jan 1, 1970), which results in a representable date range of about 290 millions years into the past and future.

Examples¶

Use Date in a Query¶

If no document with _id equal to 1 exists in the products collection, the following operation inserts a document with the field dateAdded set to the current date:

db.products.update(
   { _id: 1 },
   {
     $set: { item: "apple" },
     $setOnInsert: { dateAdded: new Date() }
   },
   { upsert: true }
)

参见

$currentDate

Return Date as a String¶

To return the date as a string, use the Date() method, as in the following example:

var myDateString = Date();

Return Date as `Date` Object¶

The mongo shell wrap objects of 日期 type with the ISODate helper; however, the objects remain of type 日期.

The following example uses new Date() to return 日期 object with the specified UTC datetime.

var myDate = new Date("2016-05-18T16:00:00Z");

参见

BSON Date, mongo Shell Date

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