Formula to return a value from one column based on date in one col and no date in other

I am attaching a sample spreadsheet to hopefully get some help on creating a formula as follows:

IN COLUMN U POPULATE THE WIDGET QUANTIY FROM COLUMN J WHEN COLUMN L HAS A DATE AND COLUMN N IS BLANK

IN COLUMN V POPULATE THE WIDGET QUANTITY FROM COLUMN J WHEN COLUMN N HAS A DATE AND COLUMN Q IS BLANK

I realize that probably one formula is needed for both - just tweak the columns in the formula.

Any help with this would be greatly appreciated. Thank you!