QB Issue Resolution:

The Inventory Valuation report will be the closest report that can give you the inventory numbers for a specific day. (Reports menu > Items > Inventory Valuation > select date)

As for the current on-hand quantity, you can see the Item List report (Reports menu > Items > Items List)

Resolution for Issue 'How do I display Opening and Closing Stock?' available: Yes (Solved).
Source: Intuit Community forum.

How do I display Opening and Closing Stock?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Inventory
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