Days Between Dates Calculator
Find out exactly how many days, weeks, and months are between two dates. Results update instantly — nothing is uploaded or saved.
How this calculator works
This tool counts full calendar days between your start and end date using date-only (UTC-based) math, so leap years and Daylight Saving Time clock changes never throw the count off by an hour or a day. If you need an exact duration down to the minute — for example, "how long between 9am Monday and 3pm Friday" — check "Include time of day" and it'll switch to a precise elapsed-time calculation instead.
Common uses
People use a days-between-dates calculator to plan project deadlines, count down to a wedding or trip, calculate age or anniversaries, figure out contract or lease terms, track pregnancy due dates, or check how many days are left until a deadline, warranty expiry, or renewal date.
Frequently asked questions
How do I calculate the number of days between two dates?
Enter a start date and an end date above — the calculator instantly shows the total number of days between them, plus a weeks/days breakdown. There's nothing to submit; results update as you type.
Does this calculator count the start date, the end date, or both?
By default it counts the span between the two dates (start date not counted as a full extra day). Check "Count the end date as a full day" if you want an inclusive count, for example when counting rental days or vacation days where both the arrival and departure day should be included.
Can I calculate days between dates including a specific time of day?
Yes. Check "Include time of day" to add start and end times — the tool will then show the exact duration in days, hours, and minutes instead of whole days only.
Is this days calculator accurate across leap years and Daylight Saving Time?
Yes. Whole-day calculations use UTC date math so leap years and Daylight Saving Time clock changes never throw off the day count. When you include a specific time of day, the tool calculates the real elapsed duration between the two exact moments.