DateSpan

Make everyday date questions easier to answer with clear, offline calendar tools.

Compare two dates with an adjustable choice to include the start date, the end date, both, or neither. See the total number of days, full weeks with remaining days, and an elapsed calendar breakdown in years, months, and days. Each result explains the counting rule it uses.

Move forward or backward from a date by days, weeks, months, or years. When a target month does not contain the original day, the calculation uses that month's final day and explains the adjustment.

Count workdays using the weekly rest days you choose. Add up to 100 personal exceptions as extra workdays or excluded dates. Results follow only your settings and do not rely on regional holiday data.

Keep personal milestones, plans, and recurring dates in one place. Add a name, date, countdown direction, monthly or yearly repeat, tag, and optional note. Search and filter entries, view upcoming or past dates, hide items from the home preview, or archive and restore them.

Completed calculations can be kept in recent history and loaded again with their inputs. Preferences include date display format, week start, default interval boundary, theme, and text size. A guide explains the calculation rules.

The app works without an account, network connection, or system calendar access. Personal dates, workday rules, preferences, and optional calculation history are stored locally on your device.