Date Calculator is a free Android application developed by Chernyshkov Evgeny, which performs mathematical manipulations with dates. It is a convenient tool that can be used to calculate the number of days spent in the hospital or bed occupancy in hotels, and to make quick calculations in the absence of a calendar. This application is also useful for calculating how many days you have lived and how many days are left until important dates.

The application offers various features such as calculating the difference between dates, time before or after the selected date, and adding or subtracting days from the selected date. It also includes a pregnancy calculator that determines the expected date of birth and the trimester of pregnancy. Furthermore, the application calculates the exact age of an individual and allows users to add notes to the calendar with the PRO version.

Date Calculator is available in English, Russian, German, Spanish, Italian, and Portuguese. Any suggestions or inquiries can be sent to with the "Android- DaysCalculator" mark in the subject line. The developer welcomes users to help make the application available in their own language.