If you're unable to adjust the dates in the scorecard for your old experiment, it could be due to the experiment's end date being set in the past. When an experiment is created, it is marked with a specific completion date. If you want to extend the experiment or adjust the dates, you have two options:
1. Clone the existing experiment and restart it, making sure to set the experiment end date to the desired date or mark it as ongoing.
2. Reset the experiment from the same menu and restart it from there.
After resetting the experiment, you can change the end date. However, you might notice that the pulse loading takes a longer time than usual. This is not normal even for this experiment. The Wall time, which is the total "real time" it took to run the job, from when it started to when it finished, might be longer than the job time, which is the actual compute time run on your warehouse. This could be due to transient network errors communicating with your warehouse, which is unusual. If you encounter this issue, it's recommended to flag it for assistance.