Need a server reboot schedule that uses date entered column, days up column and days left

I need a column called "Date Uptime Entered" where I will manually enter this date with no formula. Then I need a column called "Days Up" where I will manually enter how many days the server has been up with no formula. The next column I need called "Days Until Reboot" will calculate how many days left until a reboot is needed based on 1 every 365 days. I need this column to automatically calculate this based on the date the uptime was entered and how many days up it has been. So tomorrow the "Days until reboot" will automatically be 1 day less. If the "Days Up" is greater than 365 then I need this to show as a negative and continue counting. Thanks in advance for your help.

Well, not sure I understand completely, but maybe try this:
Date Uptime Entered is in cell A2 and Days up is in B2
=365-(TODAY()-A2+B2)