A free program for Android, by Daysmatterpro.
Days Matter Pro - Events Countdown for Android is a free application developed by Daysmatterpro intended for people who would love to take note of their upcoming events. Are you forgetful? Do you have a lot of plans or events to attend but don't know how to organize those? If you are one of them, then this app is for you. With Days Matter Pro, you can add your upcoming events and set a reminder so you won't miss them. This is not only for big events, this can also be used in any kind of schedule like doctor appointments, grocery, or anything under the sun that you'd like to be reminded of. Set events for weddings, birthdays, anniversaries, and more. You can add your custom background to each event listed. You can also see a countdown of days for that event.
Download this very useful app and start your countdown.