Q.If date fruits are about to ripe
If date fruits are about to ripe and it rains then can fruits be damaged due to rains ?
I am going to plant about 500 trees in Gujarat (India) so there is sometime premonsoon rain so pls can I be given right answer ?

According to the following article, rain during the flowering and ripening times can damage date fruits. It seems that the most serious damage happens when rain comes when the date is about to ripen, or is on the trees ready to harvest (rutab and tamar stages).
http://www.fao.org/docrep/006/y4360e/y4360e08.htm
Contacting a local extension agent or an agricultural college/university in your area is also a good idea. Many universities have outreach programs for farmers.