Do Date (iOS) app for FREE
Do Date is a date calculator and reminder app that posts daily notifications of important upcoming dates and events to your iPhone's lock screen and notification center.
Once you enter events and dates in the app, you will receive reminders every day in your lock screen telling you the event name and how many days are left before the date arrives. For example, your daily reminder may say “Jack’s 5th birthday is 8 days away.”
If you don’t want to receive reminders in your lock screen or notification center, you can easily enable/disable all or individual reminders in the app.