You are right. You should get the order date back. The field is called created_at.
In case you are not getting it, check if it is allowed in the Attributes section. System-&gt;Web Services-&gt;REST Attributes and click on the user type Admin.
If you didn't test, and just looked at the link you mentioned in the question then you should try it. I think that link just offers an example. It's not the real thing.  

I just did a test and here is what came back:

Array
(
    [41] =&gt; Array
        (
            [entity_id] =&gt; 41
            [status] =&gt; pending
            [coupon_code] =&gt; 
            [shipping_description] =&gt; United Parcel Service - Ground
            [customer_id] =&gt; 
            [base_discount_amount] =&gt; 0.0000
            [base_grand_total] =&gt; 823.4500
            [base_shipping_amount] =&gt; 11.5700
            [base_shipping_tax_amount] =&gt; 0.0000
            [base_subtotal] =&gt; 750.0000
            [base_tax_amount] =&gt; 61.8800
            [base_total_paid] =&gt; 
            [base_total_refunded] =&gt; 
            [discount_amount] =&gt; 0.0000
            [grand_total] =&gt; 823.4500
            [shipping_amount] =&gt; 11.5700
            [shipping_tax_amount] =&gt; 0.0000
            [store_to_order_rate] =&gt; 1.0000
            [subtotal] =&gt; 750.0000
            [tax_amount] =&gt; 61.8800
            [total_paid] =&gt; 
            [total_refunded] =&gt; 
            [base_shipping_discount_amount] =&gt; 0.0000
            [base_subtotal_incl_tax] =&gt; 811.8800
            [base_total_due] =&gt; 
            [shipping_discount_amount] =&gt; 0.0000
            [subtotal_incl_tax] =&gt; 811.8800
            [total_due] =&gt; 
            [increment_id] =&gt; 100000049
            [base_currency_code] =&gt; USD
            [discount_description] =&gt; 
            [remote_ip] =&gt; 216.113.168.131
            [store_currency_code] =&gt; USD
            [store_name] =&gt; Main Website
Main Website Store
English
            [created_at] =&gt; 2013-03-15 02:01:34
            [shipping_incl_tax] =&gt; 11.5700
            [base_customer_balance_amount] =&gt; 0.0000
            [customer_balance_amount] =&gt; 0.0000
            [payment_method] =&gt; checkmo
            [gift_message_from] =&gt; 
            [gift_message_to] =&gt; 
            [gift_message_body] =&gt; 
            [tax_name] =&gt; US-CA-*-Rate 1
            [tax_rate] =&gt; 8.2500
            [addresses] =&gt; Array
                ( 
               .....


Notice the created_at field.
I tested with JSON format, but I don't think that makes a difference.

How to get the sales order date from the REST api?
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