This my last word on dates!
Whole dates are harvested and marketed at three stages of their development. The choice for harvesting at one or another stage depends on varietal characteristics, climatological conditions and market demand.
The three stages are as follows:
Khalal: Physiological mature, hard and crisp, moisture content: 50 - 85 %, bright yellow or red in colour, perishable;
Rutab: Partially browned, reduced moisture content (30 - 45 %), fibres softened, perishable;
Tamar: Colour from amber to dark brown, moisture content further reduced (below 25 % down to 10% and less), texture from soft pliable to fi rm to hard, protected from insects it can be kept without special precautions over longer periods.
In general, when dates reach the Khalal stage, they are regarded to be ready for trading as "fresh" fruit.
Dates in Khalal stage are the first in the harvesting season and therefore have aready market. Only date varieties with a low amount of tannin at Khalal stage are suitable for consumption.
Harvesting in the northern hemisphere takes place at the end of summer and in the fall, starting at the end of July (depending on the geographical area), with the harvesting of the Khalal varieties (especially Barhee), and ending in the middle of November.
Edit: The fruiting period for Basra is from March through August, none are given for Tunisia, but for Algeria the fruiting period is later May through October - so can we assume that harvesting would occur later in Tunisia?
http://www.fao.org/DOCREP/006/Y4360E/y4360e0d.htm#TopOfPage
And this link
http://66.102.11.104/search?q=cache...ruit+dates+harvested+december&hl=en&ie=UTF-8? the sources : “Date Varieties and Suggested Uses” published by Oasis Date Gardens, 59-111 Highway 111, Thermal, CA 92274
“Fruits & Vegetable Facts & Pointers” by R.A. Seelig, published by United Fresh Fruit & Vegetable Association, 101 19thStreet, NW Washington, DC, August, 1974.
“Romance of the Date,” “A Date Glossary: From Barhi to Zahidi” by David Karp published by Los Angeles Times, Food Section H, Wednesday, September 21, 2001.
And this
http://www.waitrose.com/food_drink/wfi/ingredients/fruitandvegetables/9901042.asp - was about Tunisian dates!