Date Difference Calc

See the days between two dates, clearly.

Choose a start and end date to calculate the signed number of calendar days and the equivalent weeks and remaining days. The start day is excluded: the same date is zero, and an earlier end date gives a negative result.

Add or subtract a whole number of days from a date to find the resulting day. Your latest calculations stay on your device.

Keep your existing date board, title and preferences. View a month calendar, a week strip or useful date formats, choose the first weekday, show or hide week numbers, and share a text summary.

Designed for iPhone and iPad, with English and Korean interfaces. Calculations use Gregorian calendar dates from 1900 through 9999. This is calendar-day math, without business-day or holiday adjustments.

No account, ads or subscription. No calendar access or cloud service is required.