Measure gaps between dates, roll calendars forward or backward, or reveal any weekday—in three focused tabs.
Open calculator ↓Pick a tool
Choose a tab and tap the action button
to see results here
Day counts use noon UTC-stripped local dates to reduce DST edge noise.
Month/year shifts rely on built-in calendar rolling (end-of-month clamping applies).
Weeks reported as floor(days ÷ 7); remaining days listed separately. Month differences count whole calendar month boundaries.