The date stamp on the experiment cannot be changed since it is a timestamp, a time at which an experiment is recorded by SciNote and not the time of the experiment itself. The date stamp illustrates the creation and last modified date.
Nevertheless, you can edit the experiment name by adding the date before the name. The best way would be to type the date in format yyyy/mm/dd where the year is written first, then the month and lastly the day.
This will enable you to 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.