If formula, if two cells are blank, return blank, if one has a date, subtract todays date

I hope this makes sense! Using one spreadsheet with three date columns and two columns counting days.

If there is a value in Resolution date, then Column N is blank
If there is no value in Submit date and Resolution date, then Column N is blank
If there is no value in Resolution date, and there is a value in Submit date, subtract Submit date from todays date to show how many days it has been pending approval

Created on = J4
Submitted on = K4
Resolution Date = L4
Days to Approve = M4 I've got that formula =IF(L4="","",L4-K4)
Days Pending Approval= N4 (cell with formula)

If Resoultion Date L4 has a value, return blank
If Submit on K4 and Resoultion date L4 are blank, return blank
If Resolution date L4 is blank, and Submit on K4 has a value, subtract Todays date from Submit on K4 to show Days Pending Approval

Cell J4______Cell K4______Cell L4__________Cell M4__________Cell N4
Created on___Submit On___Resolution Date___Days to Approve___Days Pending Approval
4/5/13_______blank______Blank____________Blank___________Blank
4/5/13_______4/5/13_____4/7/13___________2_______________Blank
4/5/13_______4/5/13_____Blank____________Blank___________()Today-K4

Hello,

You can try this formula

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Paste it on N5 (that's where you have your first row of data right?)