I have used Google Calendar for over 10 years, and I just discovered that if you type "repeat until [date]", it will actually work.

Edit: OMG! I didn't know that I will get so many upvotes on this! The comments have motivated me to write an update: I will be putting in the effort to improve my life in the next year. I am a software developer, and I really should have better productivity. And I will. Thank you all for the encouragement and the advice.<br><br>Edit2: OMG again! I didn't expect that this will blow up. I've been getting requests for an app, so I've started working on it already, and it will be a virtual assistant.