Easily calculate the difference between dates or add/subtract time intervals. This utility app simplifies date and time arithmetic with straightforward operations.
Date and time calc by Osamu Ishigami





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Easily calculate the difference between dates or add/subtract time intervals. This utility app simplifies date and time arithmetic with straightforward operations.

This app offers a versatile calculator for everyday tasks, supporting calculations in binary, octal, decimal, and hexadecimal. It allows for complex expressions with parentheses, editing of inputs, and displays both the expression and answer on separate lines. It also handles time calculations and large numbers up to 16 significant digits.






Manage deceased individuals' information and memorial service schedules. Receive notifications for death anniversaries and easily track memorial service dates. Supports detailed registration and flexible date calculations.


Calculate the difference between dates and times, or add/subtract durations. Save your important calculations to bookmarks and enjoy a dark mode option. All features are free to use.








Easily convert between Western and Japanese eras, and determine birth years from age. Explore historical context with explanations for era changes and significant events of each year.

