Additional info

Some existing behaviour and logic from Magento 1 was implemented in a different way in Magento 2. The Data Migration Tool takes care of it.

  1. All Group Prices were converted to Tier Prices.

  2. The numbers of Orders, Invoices, Shipments, Credit Memos and RMA migrate as is. But after migration and switching to Magento 2 the numeration for newly created sales entities will be different.

  3. If the Magento 1 server has the time zone set to anything other than UTC, you must configure the offset to migrate timestamp fields. The Data Migration Tool has special handler \Migration\Handler\Timezone for transforming time to a different time zone. In the following example, the Magento 1 server timezone is UTC-7. To convert the customer account creation date properly, add the following rule to map-customer.xml:

  <?xml version="1.0" encoding="UTF-8"?>
  <map xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="../map.xsd">
    <!--...-->
    <destination>
        <field_rules>
            <!--...-->
            <transform>
                <field>customer_entity.created_at</field>
                <handler class="\Migration\Handler\Timezone">
                    <param name="offset" value="-7" />
                </handler>
            </transform>
        </field_rules>
    </destination>
  </map>
  

The Data Migration Tool doesn't support split database.