Add and sync contact birthdays (Android)

Question

Android

Hello!
So there is Samsung Gio with Android 2.3.3. Problem: in contacts on gmail, the "Birthday" field is filled in, filled with the year of birth, for example, 01/01/1981 (in gmail format), an additional calendar "Birthdays and events of contacts" has been added to the Google calendar of the account, in the calendar settings it is specified to show both calendar - contacts' birthdays are not displayed on either the computer or the phone. And for a strange reason, one birthday appeared on the account, synchronized, appeared on the phone and notified. Then another contact with the holiday was created. Synchronization - neither there, nor there is nothing. Now, in general, everyone is gone, i.e. are not displayed anywhere.
Tried deleting the "Contacts Birthdays and Events" calendar subscription and re-adding it. Silence. Not all appear. I did not expect such "miracles" at all. On my Sony Z550i, everything was just great, but here is a full-fledged OS and silence.
Question: tell me, who knows / came across how to make birthdays automatically added to the account calendar (synchronization and reminders are fine) or maybe a separate software (even if paid), which will automatically pull birthdays from the contact book and remind you when it is necessary.
Thank you!

Answer 1

Maybe there's another problem, of course. It was simpler for me: the calendar with DR contacts was shown empty on the android. It helped, if I'm not mistaken, to go into applications and clear the calendar cache there. But on the computer, everything was in order, so perhaps there is another reason.

Answer 2

eboBirthday
can download birthdays from contacts and set up notifications.
can be downloaded in some other way, but they were buggy for me.
I am using now.
Birthday Reminder GLite
itself pulls out birthdays either from gmyla or from the phone book, but each time it opens very slowly.
You can set up notifications.
Birthday Manager
itself pulls dgyukhi from the phone book, starts up very quickly.
You can set up notifications.
I don’t remember why I deleted it now, there were some shortcomings.
I did not manage to achieve that the Google-calendar bug-free showed birthdays on the calendar-widget (any). There are always two people who don't get signed up for friends' birthdays.