বল ঘড Bangla Clock is a free Android application developed by Md. Sahedul Hasan. The app provides a convenient way to keep track of time in Bengali font. It displays the date and time in Bengali, along with the Bengali day, month, and season name. Additionally, the app shows the length of the day and night in hours and minutes.

One of the most useful features of the app is the ability to display sunrise and sunset times for all districts of Bangladesh and locations around the world. Users can add their location from the settings screen to get accurate sunrise and sunset times. The app also provides district-wise prayer times according to the "Muslim World League" and "Hanafi" Juristic methods. Users can set alarms for prayer times and add their own city from the settings. The app also includes Bangla, English, and Hijri calendars.