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Make everyday date questions easier to answer. Compare two dates, move forward or backward on the calendar, count workdays using your own rules, and keep meaningful personal dates together. DATE INTERVALS Choose a start and end date, then decide whether to include either boundary. See the total number of counted days, complete weeks with remaining days, and a separate calendar years-months-days breakdown. The calculation explains the selected counting rule and preserves the direction of your dates. DATE ADJUSTMENTS Add or subtract days, weeks, months, or years from a date. When the destination month does not contain the original day, the result uses the final day of that month and explains the adjustment. PERSONAL WORKDAY RULES Choose your regular weekly rest days and add up to 100 custom excluded dates or extra workdays. Extra workdays override the weekly pattern. Results use only the rules you provide; no regional holiday calendar is included. PERSONAL DATES Save a title, date, counting direction, optional monthly or yearly repeat, tag, and note. Review upcoming or past dates, search your list, filter by tag, hide items from the home timeline, or archive and restore them. Each detail shows a clear calendar distance. LOCAL HISTORY AND PREFERENCES Save calculations with their inputs and rules, load them later, copy results, or remove individual records and clear history. Choose a display date format, week start, default interval boundaries, theme, and text size. Calculations work offline using calendar dates. Personal dates, preferences, custom workday rules, and saved calculations are stored locally on your device. The app does not access your system calendar or contacts and does not look up official holidays.