Where do you see it ask when did you purchase it? I don't recall that question except when entering an Asset to depreciate it. You can just enter the grand total for each expense category on Schedule C. You don't have to break it out. Maybe you are in the wrong spot?
Where to enter expenses in the Online Self Employed version
https://ttlc.intuit.com/questions/3636848-where-do-i-enter-my-self-employment-business-expenses-like...
