Al-Moazin Lite is a lightweight piece of software designed for people of Muslim faith which can be used to find the proper direction of Qibla. This application uses your GPS information in order to provide accurate prayer times, regardless of your position on Earth. A big plus is the minimalistic user interface where you will find a list containing the prayer times and the Hijri Calendar.
Being a lite version, this app should work just fine even on older devices as long as they have a GPS sensor incoporated. With regard to the included calendar, you are allowed to display and convert Hijri to Gregorian dates and vise versa. If you're willing to pay an amount of money for the Pro version, you can obtain a package containing extra features.
For example, you can configure the app to send notifications related to prayer times.