Change date assigned to the output of a synthetic variable

I want to change the date that is assigned to the output of a synthetic variable. I have a synthetic variable that outputs a value calculated from data recorded over the last 24 hours, but instead of assigning this output to the date that it is calculated, I want it to be assigned to the day after it is calculated.

Example:

On day one, data collection starts. On day two, at 11 am, a calculation is made from the last 24hours of data (from 11am on day one to 11am on day two). But I want this calculated output to be assigned the date of day 3.

Is this possible?