日期算 is a productivity application designed for Android devices, offering users precise date calculations and planning tools. The app features two core functionalities: interval calculation and date forecasting. Users can easily input two dates to determine the number of days between them, accommodating leap years and cross-year calculations, which is particularly useful for tracking anniversaries, business trips, or project timelines.

In addition to interval calculations, 日期算 allows users to calculate future or past dates by specifying a start date and adding or subtracting a certain number of days. This feature simplifies the planning of schedules, repayment reminders, and more, making it a practical tool for anyone looking to manage their time effectively.