The experiment date includes the creation and last modified date. These dates cannot be changed since they signify a timestamp, illustrating a time of the change recorded in sciNote.
We are aware that this is not practical when the experiment has already started and you enter the data after it has begun.
Nevertheless, you can edit the experiment name by adding the date before the name. The best way would be to add the date in format yyyy/mm/dd, so you can sort the experiments by the newest at the top if you choose From A to Z action from the drop-down menu of Sort by button (on the left upper corner on the Project's experiments overview).