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Greetings! Is there a way in TI-84 Basic to add and subtract from dates? For example, input a date, then add or subtract some number of days, say, 17, and get the new date as a result? Thanks
I have made a program like this before. I will check my calculator archives and be right back with you (I will edit this post when I find the program)

EDIT: I am currently making revisions to the program to make it user-friendly.

EDIT: I have made the program user friendly. It is also in ti-basic. You can add and subtract years, months, days, hours, minutes, and even seconds. Here is the link: https://www.dropbox.com/s/td9ji2h6kmd0h15/TIME.8xp?dl=0

The original reason why I made this program, was when I was programming clash of clans on the CE. I needed to use that program to know when something finished upgrading.

I hope that program helps. Let me know how it is.
Convert the date to seconds, subtract/add 17*24*60*60 (Converting days->hours->minutes->seconds) from it, convert back to a date.
That's great, thanks, everyone! I'll try out this weekend and let you know how they work.
  
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