Date Calculator
Find the exact number of days, weeks, and months between two dates.
| Period | Days | Weeks |
|---|---|---|
| 1 week | 7 | 1.0 |
| 1 month (30-day month) | 30 | 4.3 |
| 1 quarter (3 months) | 91 | 13.0 |
| 6 months | 182 | 26.0 |
| 1 year | 365 | 52.1 |
| 1 leap year | 366 | 52.3 |
| 5 years (avg., incl. leap days) | 1,826 | 260.9 |
| 10 years (avg., incl. leap days) | 3,653 | 521.9 |
Frequently asked questions
How is the years/months/days breakdown calculated?
We calculate a calendar-accurate breakdown, accounting for varying month lengths — so, for example, the gap between January 1 and March 1 correctly shows as 2 months, not a fixed 60 days.
Does this handle leap years correctly?
Yes — since the calculation is based on real calendar dates rather than a fixed average, leap years are automatically accounted for.
Can I calculate a date in the past?
Yes — enter any two dates in either order; the calculator automatically figures out which is earlier and shows the correct duration between them.
What's the difference between total days and weeks shown?
Total days is the exact day count between the two dates. Weeks shows that same duration divided into whole weeks, useful for things like pregnancy tracking or project timelines.
How many days are in 3 months or 6 months?
A calendar quarter (3 months) is typically 91 days, and 6 months is typically 182 days — but the exact count depends on which months are included, since months range from 28 to 31 days. Enter your own two dates above for an exact count.
How do I calculate the number of days until a future date, like a deadline or wedding?
Enter today's date as the start date and the future date as the end date, and the calculator will return the exact number of days, weeks, and the calendar-accurate months and days between them.
Does this calculator treat every month as 30 days?
No — it uses the actual calendar dates you enter, so a month can count as 28, 29, 30, or 31 days depending on which month it is. The 30-day figure in the table above is only a common approximation for quick estimates.
Does the calculator include the start and end date?
It counts the days from the start of the first date to the start of the second, so 1 January to 2 January is 1 day. If you need both dates to count, add one to the result.
Why is the number of months sometimes different from days divided by 30?
Months have 28 to 31 days, so the calendar breakdown counts whole calendar months. For example, 1 January to 1 March is 59 days but exactly 2 months, and 59 divided by 30 would give a figure of about 1.97.
Does the order of the dates matter?
No. The calculator always measures from the earlier date to the later one, so entering the dates the other way round gives the same result.
About this tool
This calculator finds the exact duration between two dates, shown as total days, a calendar-accurate years/months/days breakdown, and total weeks. Useful for tracking deadlines, ages, anniversaries, or any date-based planning.
Worked examples
The calculator reports the total number of days between the two dates and a calendar breakdown. The total counts the days between midnight on each date, so the start date is not counted but the end date is: 1 January to 2 January is 1 day. The breakdown counts whole calendar months first and then the leftover days.
| Start | End | Total days | Years, months and days |
|---|---|---|---|
| 2026-01-01 | 2026-03-01 | 59 days | 2 months 0 days |
| 2026-01-31 | 2026-03-01 | 29 days | 1 month 1 day |
| 2026-03-31 | 2026-04-30 | 30 days | 1 month 0 days |
| 2026-10-20 | 2026-12-25 | 66 days | 2 months 5 days |
| 2026-10-20 | 2027-01-01 | 73 days | 2 months 12 days |
| 2026-01-01 | 2027-01-01 | 365 days | 1 year 0 months 0 days |
The second row shows why a month is not a fixed number of days: 31 January to 1 March is 29 days, which the calculator reports as 1 month and 1 day because 28 February is the last day of the shorter month. If you swap the two dates you get the same answer, since the calculator always measures from the earlier date to the later one.
Counting days for deadlines and planning
- Countdowns. Put today's date in the first box and the event in the second to see how many days remain. From 20 October 2026 to 25 December 2026 is 66 days, or 9 full weeks.
- Notice periods and contracts. Many agreements run for a number of days, such as a 30-day notice or a 90-day trial. Enter the start date and the end date to check the length.
- Warranties and returns. Check how many days have passed since a purchase.
- Project planning. Find the number of weeks between two milestones. For working days only, subtract weekends and public holidays, which this tool does not do.
Inclusive and exclusive counting
Whether the first and last day both count depends on the rule you are following. Counting 1 to 7 January as seven days is inclusive. The calculator uses the exclusive method, so it gives 6 days between those dates. If a legal or contractual period is counted inclusively, add one day to the result. Some jurisdictions and contracts exclude the first day, so check the wording.