I had put the wrong inventory date i.e. instead of 26/03/21 i put 26/04/21

We can deactivate and recreate the inventory item, at24hrs.

If you haven't used the items, we can deactivate them and then add it as new Let me guide you how:

1. From the Sales tab, select Product and Services.
2. Locate the item.
3. Under ACTION, click the Edit drop-down.
4. Select Make inactive.
5. Select Yes.

Afterward, you're good to add the item again and ensure to enter the correct date.

If you've already use the items in a transaction, we'll have to toggle the incorrect items and replace it with the newly created one.

I've also added this guide about managing inventories in QuickBooks Online: Use reports to see your sales and inventory status

I'm just a post-away if anything arises. Have a good one!