The NanakShahi Calendaris a free Android application designed for personalization, specifically for Sikhs. This tropical solar calendar, adopted by the Shiromani Gurdwara Prabhandak Committee, outlines important dates related to Sikh events and is rooted in the teachings of Guru Nanak, the founder of Sikhism. It is scientifically designed to maintain accuracy with the sun's position, ensuring that seasons align correctly year after year.

Key features include a fixed structure where the year consists of 365 days, with 5 months of 31 days and 6 months of 30 days, and a leap year occurring every four years. The calendar is based on the Gurbani, with months directly derived from the Guru Granth Sahib, making it a culturally significant tool for followers. The New Year's Day aligns with March 14 in the Gregorian calendar, providing a seamless transition for users familiar with both systems.