"date upon which" is correct and usable in written English.
It can be used to refer to a specific date in the future for an event or task, and is usually associated with an agreement or promise. For example: "The parties agreed to the date upon which the payment must be made."
The Roman Christian historian Sextus Julius Africanus dated Jesus' conception to March 25 (the same date upon which he held that the world was created), which, after nine months in his mother's womb, would result in a December 25 birth.
The five-man selection committee only had to find a suitable date upon which to make Bjorn's announcement.
The conclusion of that disciplinary period is not the date upon which the organization can return or regains recognized status.
The February target date is at least a month earlier than the date upon which officials previously said they would settle on a final proposal.
It will be a date upon which we will recognize our loss of innocence and the new reality of our vulnerability.
The reorganization plan described in this section shall be printed in the Federal Register after the date upon which it first becomes effective.
The authors provide an interactive web application that allows readers to examine other counter-factual scenarios in the context of what happened in Scott County, including dialing up (or down) the effectiveness of interventions and "turning back time," by changing the dates upon which they were initiated.
Read the US Flag Code, especially Section 6d, for days and dates upon which the flag should regularly fly.
Specify the amounts of the deposit and monthly payments, the dates upon which each payment is due, and the beginning and ending dates of the payments.
There was also this weird dog dating wall, upon which owners could post up ads to finding a mate for their pets, mirroring the human "marriage market" at People's Park in Shanghai city centre.
Groundbreaking is expected this fall, though the completion date varies, depending upon which agency is asked.
