How this instrument works
This is a general-purpose date-span calculation, not a birth-date one: enter any two dates — a booking date and a trip date, today and a deadline, an anniversary and the date you're planning around — and get the span between them as both a total day count and a total in complete weeks.
Both figures come from the same underlying day count, run on the civil (Gregorian) calendar so every leap day between the two dates is already accounted for automatically. The week figure is that same day total divided down and rounded to the last complete week, useful when a span is more naturally discussed in weeks than in a large day count.
For a birth-date-to-today age instead of a span between two arbitrary dates, see the Age Calculator or one of this site's other age instruments; for the fuller years/months/days breakdown of an arbitrary span rather than just days and weeks, see Day Counter.
- Enter the first date.
- Enter the second date — order doesn't matter; the instrument always measures from the earlier date to the later one.
- Read Total days and Total weeks beneath the two dates.
- For a years/months/days breakdown of the same span instead of days and weeks, use Day Counter.
Worked example — 28 July 2026 to 1 August 2027
Enter 28 July 2026 as the first date and 1 August 2027 as the second. Total days reads 369, and Total weeks reads 52.
369 days is a little over a year — roughly a year-long project timeline, lease term, or engagement-to-wedding window — and 369 ÷ 7 = 52.71, which floors to 52 complete weeks with 5 days left over that don't add up to a 53rd.
Questions
Does it matter which date I enter first?
No — the instrument always measures from the earlier date to the later one, so Total days and Total weeks come out the same regardless of which field you fill in first.
What's this useful for beyond birthdays?
Anything with two dates and a span between them: how many days until a wedding or trip, how long a lease or contract runs, how many weeks a project has left. It doesn't assume either date is a birth date.
How is this different from Day Counter?
Both take two arbitrary dates. This instrument reports the span as total days and total weeks; Day Counter additionally reports the same span as a years/months/days breakdown, for when you want the fuller calendar-style answer alongside the raw totals.
Does the day count include both dates or just the span between them?
It's the number of days elapsed between them — the same way you'd count nights between two calendar dates — not a count of the two calendar squares themselves.
Can I use this to count down to a future date?
Yes — enter today as the first date and the future date as the second, and Total days and Total weeks give you the countdown in both units.