Dates and DaysDate calculator
Days between two dates, or a date a number of days out
This month
Working: show which days were skipped
| Date | Why it was skipped |
|---|
How this was counted
Pick two dates to count the days between them, or switch to adding or subtracting days from a date. Both readings of "days between" are offered, and the answer always says which one it used. Every figure is computed here in your browser.
Which reading of "days between" you want
Two people asking how many days lie between the 1st and the 8th can want different answers. Seven is the gap: the number of nights, and the number you add to one date to reach the other. Eight is the count of dates involved, which is what "how long is my trip" means when both ends are days you are somewhere.
The calculator gives the gap unless you tick "Count both endpoints", and the sentence under the answer names the reading it used. Check that setting when you compare the result with another date count.
Why the arithmetic runs in whole days
A date here is a year, a month and a day, with no time of day attached. Every calculation converts to midnight UTC, does integer arithmetic on whole days, and converts back. That matters twice a year: local-time arithmetic across a daylight-saving change gains or loses an hour, and an hour is enough to land an answer on the wrong date. Local time is used only for the word "today", because that depends on where you are. The rules are written out in full, with the statute they come from.
Counting working days
Most shipping windows and legal deadlines count working days, with weekends and public holidays taken out. For those, the business days calculator takes out weekends and US federal holidays, and you can see every day it removed.
Every calculator on this site
One line each. Each one runs in your browser.
- 90 days from today — a date a set span out, with the month-end convention named
- Business days calculator — weekends and federal holidays removed, each skipped day listed
- How old you are, to the day — years, months and days, with the 29 February rule you choose
- Days until any date — calendar and business days, with the weekday it lands on
- When Chinese New Year falls — zodiac animal, leap month, and undecidable years flagged
- Equinoxes and solstices — to the minute, 1800 to 2150, plus the harvest moon
- What day of the week was it — any date, plus what it was called before a calendar switch
- Hijri date converter — both directions on the tabular calendar, stated as such
- Hebrew birthday calculator — your Hebrew date of birth and the civil date each year
- Hebrew date converter — both directions, with every observance of the year
- Federal holidays by year — the eleven in 5 U.S.C. § 6103, observed date named separately
- When Easter falls — both reckonings, plus every movable feast defined from it
- Hours between two times — one shift or a week, with breaks and rounding
- What a time is somewhere else — the offset for the actual date, including the unusual weeks
- Which day of the year — both directions, including the reverse lookup from a lot code
- Which week number — ISO 8601 and the US convention side by side
- What phase the Moon is in — illumination, moon age, and the exact instant each phase begins
- Root, leaf, flower and fruit days — the Moon’s sidereal sign and the biodynamic day-type
- The conventions themselves — four guides on where careful counting disagrees