Date Difference Calculator

Enter a Start Date and an End Date and the result updates instantly, showing the gap four ways: total days, total weeks, a calendar-accurate years-and-months figure, and leftover extra days. The years/months figure accounts for real calendar lengths and leap years rather than assuming every month is 30 days. It doesn’t matter which date you enter first — if the end date is earlier, the tool swaps them automatically and shows the absolute difference with a note.