Ok, I now see the issue. your DOB is stored in the database in gregorian as 19780711 which as you say is 1357/04/20 however the problem arises because 11th July 2020 is indeed the 21/04/1399 in your calendar rather than 20/04/1399
Next year it will be on the correct day, it is something to do with leap years I think possiblyنوشته شده توسط HuwR
Ok.. you are right...
tanx