吉真万年历-老黄历 is a traditional calendar app designed for iPhone users. It offers a range of practical features such as calendar queries, lunar calendar conversions, holiday reminders, and event scheduling. The app provides accurate information on both the Gregorian and lunar calendars, including festivals, holidays, and traditional Chinese almanac details.

Users can access daily auspicious and inauspicious activities, the five elements, as well as information on the Twelve Day Exclusions and the Twenty-Eight Constellations. Additionally, the app offers reminders for scheduling events, birthdays, memos, to-dos, anniversaries, and countdowns. It also assists users in selecting auspicious days for activities like weddings, business openings, travel, and proposals, ensuring optimal timing for their endeavors.