Date Time
Days Until Calculator
Count whole days from today until a target date.
Free to use — no sign-up or login.
Result
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Days until counts from this morning to a date you pick. The result is a whole-day count, then a breakdown into weeks and leftover days, plus the weekday of the target. You do not type a number of days; you type the date.
If you need hours and minutes as well, use the How Long Until Calculator. If you already know the number of days and want the date, use Days From Today.
Today counts as zero
A target of today is 0 days, not 1. The count is the number of midnights between this morning and the target morning. There is no checkbox for including the end date, because that would turn a same-day target into 1 and hide the convention.
A past date is said in words
If the target is earlier than today, the result says how many days ago it was, with the weekday, instead of a bare negative number. The weeks line uses the same absolute span.
Worked example: today versus a later date
If today is 13 November 2026 and the target is the same day, the result is 0 days (today). A target 16 days later, 29 November 2026, is 16 days, which is 2 weeks and 2 days. Today counts as 0, not 1.
\[ \Delta = t_{\mathrm{target}}-t_{\mathrm{today}} \]
Frequently asked questions
Why is today 0 days and not 1?
The count is the number of midnights from this morning to the target morning. The same morning is zero.
What if the date has already passed?
The result says the number of days ago and keeps the weekday, instead of showing a minus sign.
Does the week line count a partial week?
Whole weeks come first, then the leftover days. Sixteen days is 2 weeks and 2 days.
Can I include the end date as an extra day?
No. Adding one would make today equal 1. The page keeps a single rule so the count is predictable.
How do I count hours until a time of day?
Use How Long Until and enter a date and time. This page ignores the clock.
References
Assumptions and limitations
The count is calendar midnights in the device’s local date. It does not include hours, holidays, or a second time zone.