iPhone 4s Birthday calendar - all birthdays 1 day behind, how do I solve??!!

i have got new iphone 4s , of birthdays on birthday calendar 1 day before should be.

have tired editing them on contacts doesn't work. have checked time zone , down london gmt correct, date , time correct. can't edit of birthday entries.

ideas?? know seems issue others having

thanks.

 

joining in on question

know draws dates calendar contacts app, might stuck it, made ical facebook gcal , sync on iphone instead of automated one.

 

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