Help! Newbie Assistance With Formulas!

I am an admitted Newbie.  I'm fairly good with Excel - but switching to Numbers on my new iMac is making me nuts!
I'm trying to do something really simple - but getting nowhere.  Apparently, from what I've read - there is a learning curve in working with Dates & Times in Numbers that I am not at all familiar with.  So I'll explain my dilemma and hope someone can help me:
1)   I've got an Hourly Log that shows a date (Column A), start time (Column B), end time (Col C), and duration (Col D).
2)   I've figured out how to get the Duration calculation done.
3)   And I've figured out how to get a sum of the Durations with a typical =sum(C7:C18) formula.
4)   What I can't figure out how to do - is to place the Durations formula in Column D so that - if there are no hours entered on a date, it will just be blank.  This is a problem, because I need to have the spreadsheet set up to automatically calculate if hours are entered - or leave a blank cell in D if there are no hours.  I tried to set it up to go ahead and show a "0" if no hours are entered - but then that gives me an error message in the Total that says "the values being added must be either all durations or all numbers. "
In Excel (which I know, I shouldn't be mentioning - but this is all I know so far!) -- it would be an =IF formula -- but I can't seem to make anything like that work here.
Any assistance would be appreciated!!  I'm desperate!
Thanks --
    Kelly

Thank you so much for your help, Wayne!  I believe that helped me solve the calculations issue - so I'm good there. 
But I'm still having a huge problem understanding the Date/Time conundrum!  So - let me see if I can explain what I understand on that so far:
a)  Any time a Time value is entered in a cell, it is automatically going to include (for example) today's date.  (I did notice that when I entered a time, it would add today's date - so I'm assuming that is what you're talking about on going back to look at the contents of a cell with a time value, and I'll see what date that time value was entered - right?
b)  Using a Custom format, even though the date is technically "there" in the cell - I can get my spreadsheet to not show that.  (which I managed to do)
c)  But that my hours - for example, if I'm calculating hours worked between 9am - 2pm -- I need to make sure the date is the same for both (whether it's showing or not), or it's not going to calculate correctly.  Is that right?
I haven't figured out how to format the cell as text, though - and still have it calculation the Duration . . .?   In fact, when I format it as text -- it goes back to showing the whole date/time/am/pm info.  In short......
ARGHHHHH!
I'm leafing through manuals as quickly as I can, but oy - the learning curve!  If you could just let me know if my understanding thus far is correct - that would help tremendously!
Thank you again!
   Kelly

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