¿Cómo funciona Birthday Adapter?

Birthday Adapter crea un SyncAdapter nuevo en su dispositivo Android, que sincroniza todos los eventos como cumpleaños, aniversarios, etc. de sus contactos con un calendario. Este calendario se muestra en su aplicación estándar Android Calendar.

¡Quiero sincronizar los eventos con un calendario existente!

This is not the idea of this app. As you already have all birthdays in your contacts and synchronizing these into the cloud, it would be redundant to also synchronize a calendar with the same information. Instead use tools on your desktop pc to display the birthdays from your contacts in your calendar, like Birthday Adapter does. In Thunderbird this can be done with the Thunderbirthday Add-on.

Events are not shown in Androids calendar widget!

All-day events are not displayed at the day the event occurs on Android 4.0. This is fixed on Android 4.04.
See Android Bug 22365 for more information.

How often are contact events synchronized into the calendar?

This is done once a day and invoked by Android itself together with other synchronizations.

The synchronization isn't working!

Please check the following:

I found a bug in Birthday Adapter!

Por favor, infórmelo en el bug tracker de Birthday Adapter.