How to find the number of days until a specific date

How to find the number of days until a specific date

How would I be able to show the number of days until a specific date. The date im trying to base this on is imported with leads into the CRM. (the date format being imported is 04/30/2015)

For example: I have a lead imported with an end date of 04/30/2015. I would like to show the number of days remaining until that end date and would also like for it to be dynamic as the end date gets closer.

I have never tried working with formulas in zoho but being an extremely techy guy, I feel like my pride is getting a beating lol. 

HELP PLEASE!  :)

Here is my terrible excuse of an attempt so far. 

Datecomp(Now()-${Leads.Account Expiration Date})/1440