The Druk Zakar App offers a 12-month, day-to-day astrological calendar based on the Bhutanese lunar year. It draws from the Datho (Book of Astrology), published by the Dratshang Lhentshog, Bhutan’s Council for Religious Affairs. Druk Zakar provides daily guidance on auspicious and inauspicious activities, helping users know which actions — such as hoisting a flag or starting important work — are favorable or best avoided on any given day.