K Calendar is a user-friendly Android app developed by OPTISTECH CO. LTD. It offers a simple and efficient way to convert dates between the international date and Khmer lunar date. The app is designed entirely in the Khmer language, making it accessible and easy to use for Cambodian users.

One of the main features of K Calendar is its ability to provide information about Cambodian national holidays and various religious events according to the Khmer lunar calendar. This feature allows users to stay informed about important dates and plan their activities accordingly.

The app also includes an international calendar, which is useful for users who need to keep track of both the international and Khmer lunar dates. Additionally, K Calendar offers a convenient calendar widget that can be placed on the home screen for quick access to date conversion and holiday information.

With its intuitive interface and comprehensive features, K Calendar is a valuable tool for Cambodian users who need to convert dates between the international and Khmer lunar calendars, as well as stay updated on national holidays and religious events.