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59 changes: 43 additions & 16 deletions source/reference/operator/aggregation/toDate.txt
Original file line number Diff line number Diff line change
Expand Up @@ -98,11 +98,11 @@ date:

The string must be a valid date string, such as:

- "2018-03-03"
- "2018-03-20"

- "2018-03-03T12:00:00Z"
- "2018-03-20T12:00:00Z"

- "2018-03-03T12:00:00+0500"
- "2018-03-20T12:00:00+0500"

* - ObjectId

Expand All @@ -125,16 +125,16 @@ The following table lists some conversion to date examples:
- ISODate("2009-09-19T14:53:56Z")

* - ``{$toDate: NumberLong("1100000000000")}``
- ISODate("2004-11-09T11:33:20Z")
- ISODate("2004-11-19T11:33:20Z")

* - ``{$toDate: NumberLong("-1100000000000")}``
- ISODate("1935-02-22T12:26:40Z")

* - ``{$toDate: ObjectId("5ab9c3da31c2ab715d421285")}``
- ISODate("2018-03-27T04:08:58Z")

* - ``{$toDate: "2018-03-03"}``
- ISODate("2018-03-03T00:00:00Z")
* - ``{$toDate: "2018-03-20"}``
- ISODate("2018-03-20T00:00:00Z")

* - ``{$toDate: "2018-03-20 11:00:06 +0500"}``
- ISODate("2018-03-20T06:00:06Z")
Expand All @@ -150,16 +150,15 @@ Create a collection ``orders`` with the following documents:
.. code-block:: javascript

db.orders.insert( [
{ _id: 1, item: "apple", qty: 5, order_date: new Date("2018-03-10") },
{ _id: 2, item: "pie", qty: 10, order_date: new Date("2018-03-12")},
{ _id: 3, item: "ice cream", qty: 2, price: "4.99", order_date: "2018-03-05" },
{ _id: 4, item: "almonds" , qty: 5, price: 5, order_date: "2018-03-05 +10:00"}
{ _id: 1, item: "apple", qty: 5, price: 2, order_date: new Date( "2018-03-20" ) },
{ _id: 2, item: "pie", qty: 10, price: 3, order_date: new Date( "2018-03-22" ) },
{ _id: 3, item: "ice cream", qty: 2, price: 4, order_date: "2018-03-15" },
{ _id: 4, item: "almonds" , qty: 5, price: 7, order_date: "2018-03-15 +10:00" }
] )

The following aggregation operation on the ``orders`` collection
converts the ``order_date`` to date before sorting by the date value:


.. code-block:: javascript

// Define stage to add convertedDate field with the converted order_date value
Expand All @@ -179,16 +178,44 @@ converts the ``order_date`` to date before sorting by the date value:
db.orders.aggregate( [
dateConversionStage,
sortStage
])
] )

The operation returns the following documents:

.. code-block:: javascript

{ "_id" : 4, "item" : "almonds", "qty" : 5, "price" : 5, "order_date" : "2018-03-05 +10:00", "convertedDate" : ISODate("2018-03-04T14:00:00Z") }
{ "_id" : 3, "item" : "ice cream", "qty" : 2, "price" : "4.99", "order_date" : "2018-03-05", "convertedDate" : ISODate("2018-03-05T00:00:00Z") }
{ "_id" : 1, "item" : "apple", "qty" : 5, "order_date" : ISODate("2018-03-10T00:00:00Z"), "convertedDate" : ISODate("2018-03-10T00:00:00Z") }
{ "_id" : 2, "item" : "pie", "qty" : 10, "order_date" : ISODate("2018-03-12T00:00:00Z"), "convertedDate" : ISODate("2018-03-12T00:00:00Z") }
{
_id: 4,
item: 'almonds',
qty: 5,
price: 7,
order_date: '2018-03-15 +10:00',
convertedDate: ISODate("2018-03-14T14:00:00.000Z")
},
{
_id: 3,
item: 'ice cream',
qty: 2,
price: 4,
order_date: '2018-03-15',
convertedDate: ISODate("2018-03-15T00:00:00.000Z")
},
{
_id: 1,
item: 'apple',
qty: 5,
price: 2,
order_date: ISODate("2018-03-20T00:00:00.000Z"),
convertedDate: ISODate("2018-03-20T00:00:00.000Z")
},
{
_id: 2,
item: 'pie',
qty: 10,
price: 3,
order_date: ISODate("2018-03-22T00:00:00.000Z"),
convertedDate: ISODate("2018-03-22T00:00:00.000Z")
}

.. note::

Expand Down