It can be use with Google Calendar. It support daily, weekly, monthly and yearly calendar functions. It support public holiday for +30 regions. Voice reminders (TTS) notify you the event with voice. You can also search the calendar.

Lunar phase, sunrise and sunset time (requires positioning / GPS) are supported. Over 10 widgets are available. They are agenda and calendars, clock, world cities time, and sticky note with voice recording feature, counter, todo list, etc.