How do I save a custom cell format that I created?
 

I created a custom cell format "yyyy-mm-dd h:mm" that I need to use on
multiple worksheets and am tired of having to type it into the custom format
each worksheet that I open to work on. How can it be saved to Excel 2003 to
save time?

How do I save a custom cell format that I created?
 

If I'm not mistaken, once you've defined it it should be in the list of
Custom formats. Scroll down to at or near the bottom of the list and
click on it.