Alert message when program in background [Titanium]

I'm making count down timer for iPhone and Android. The problem is alert message. When I close the app , program is not working and alert can't show. So, I think ... I should add in iCal and it will alert but I don't know how to make 开发者_如何学Gowith Titanium and

how to make schedule task or alert message in Titanium for iPhone and Android ?

The alerts for background applications are called Push Notifications. Please refer to the corresponding article: http://support.apple.com/kb/HT3576