Days (and weeks) between dates
Work out exactly how many days — and weeks — are between two dates, for deadlines, notice periods, countdowns, anniversaries or any date-difference question.
Result
Days between
Weeks between
Whole weeks
Plus days
How to use this tool
- Enter the start date.
- Enter the end date.
- Read the elapsed days, the same span in weeks, and the whole-weeks-plus-days breakdown.
Assumptions
- Counts calendar days, including weekends and public holidays.
- Dates are treated as whole days, so time zones and clock changes don't shift the result.
Technical details: what the fields mean
- Start date
startDate - The earlier date — usually today, or the day something starts.
- End date
endDate - The later date. If it's before the start date, the results are negative.
Methodology
Elapsed days = end date − start date, in whole calendar days (the start date is excluded, the end date is the boundary). Weeks = days ÷ 7 to one decimal place; whole weeks and remaining days split the same total, e.g. 10 days = 1 week + 3 days.
Worked example
1 Jan 2026 to 11 Jan 2026
Inputs: Start date: 2026-01-01, End date: 2026-01-11
Result: 10 elapsed days = 1.4 weeks = 1 week + 3 days.
A four-week notice period from 1 Jan 2026
Inputs: Start date: 2026-01-01, End date: 2026-01-29
Result: 28 days = exactly 4 weeks — so 29 January is four weeks after 1 January.
Countdown from 12 Oct 2026 to Christmas Day
Inputs: Start date: 2026-10-12, End date: 2026-12-25
Result: 74 days = 10 weeks + 4 days.
Counting both dates (e.g. a hotel stay or event that runs 1–11 Jan)
Inputs: Start date: 2026-01-01, End date: 2026-01-12
Result: 11 — set the end date one day later to include the last day. For nights in a hotel, the plain difference (10) is the number of nights.
Practical guidance
- For working-day counts that skip weekends, use the business days calculator.
- For 'what date is 30 days from now?', use add/subtract days — this tool goes the other way.
- Contracts and legal notice periods can define 'days' differently (calendar vs business, inclusive vs exclusive); check the wording before relying on a count.
Common mistakes
- Expecting this to exclude weekends — it counts every calendar day.
- Forgetting the end date isn't counted, which makes inclusive counts (event days, leave days) one short.
FAQs
Are both the start and end dates included?
No. This reports elapsed days: end date minus start date. For 1 January to 11 January, the result is 10 days. To include both, set the end date one day later.
How many weeks is that?
Shown alongside the days, both as a decimal (10 days = 1.4 weeks) and as whole weeks plus days (1 week + 3 days).
Is the weeks figure a calendar week number?
No — it's elapsed time. For calendar week numbers (ISO weeks), you need a calendar that shows week numbers.
Last reviewed: 2026-10-11
Counts calendar days only — for working-day counts, use the business days between dates calculator; for whole calendar months, use months between dates.
This tool provides an indicative estimate, based on the assumptions stated above.
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