Date Difference Calculator
Calculate the exact difference between two dates in years, months, weeks, and days. Free to use, no signup required for occasional use.
What is the Date Difference Calculator?
The Date Difference Calculator finds the exact span of time between any two dates, expressed both as years/months/days and as total weeks and total days. It automatically handles which date comes first, so the order you enter them in doesn't matter. This is useful for calculating anniversaries, project durations, time until or since an event, contract lengths, or any other date-span calculation you'd otherwise have to work out by hand on a calendar.
How to use it
Select your first date and your second date using the date pickers, then click 'Calculate difference'. The result shows the gap broken down into years, months, and days, plus the total number of weeks and total number of days between the two dates.
Frequently asked questions
Does it matter which date I enter first?
No, the tool automatically works out the earlier and later date regardless of the order you enter them.
How is the years/months/days breakdown calculated?
It calculates calendar-accurate years, months, and remaining days, correctly accounting for different month lengths.
Can I use this for future dates as well as past dates?
Yes, it works the same way whether both dates are in the past, the future, or a mix of both.