I have harvested my crop but cant seem to find where to enter the date etc. Thanks
As soon as you hit the Harvest button (the little scissor/clipper icon) the date is set, and your plant(s) will start accumulating days in the Dry/Cure Tab under Manage Plants.
You can also go to Manage Garden, and click on History...the date that your Harvest started will be in there among other stats...
Hope this helped.