How can I export a report from QBs with a specific period ( from-to )? example start date 1/12/2019 to 31/12/2019

I'm happy to see you again here in the Community, @Omar Alolabi.

Exporting reports with a specific period comes with easy steps. I got you covered on how to accomplish this goal.

You'll need to customize the date of the report to your desired range and then export it.

To do that:

1. Click on Report at the left pane.
2. Look for the report that you want to pull up.
3. Enter the your desired date range (1/12/2019 to 31/12/2019) on the Report period.
4. Press on Run report.
5. Tick on the Export icon and choose Export to Excel. 

Here are some references that contain more details about customizing and exporting reports in QuickBooks Online. Feel free to check them out:

• Customise reports in QuickBooks Online
• Export reports, lists, and more

Let me know if there's anything else that I can assist you with. I'll be right here to help. Have a good one!