It appears like 00.00 am is fixed and cannot change, wanna move to late afternoon.
I’d love for this to be possible, too.
You might be able to hack it by using IFTTT to mirror the data to a new goal, set the new goal’s deadline to what you want and the aggday to last. I think that might get you 90% of the way there. The last 10% could be taken care of by setting up an additional IFTTT applet to post a zero datapoint to the new goal every 1am or something, to ensure you don’t get credit for yesterday’s work if you don’t post any datapoints today.