"How many days until…?" sounds like a simple question until you try counting on a calendar — months have different lengths, leap years insert an extra day, and it is easy to lose count past a few weeks. The NexToolz Days Between Dates Calculator does it exactly: pick any two dates and get the precise number of days between them, also expressed in weeks and days.
It is the tool behind everyday planning: counting down to an exam, a wedding, a visa expiry, a project deadline or a delivery date; working out how long a course, a notice period or a subscription runs; or checking how many days have passed since an event. The result also shows which weekday each of your dates falls on, which is often the detail you actually needed for scheduling.
By default the count is the exact difference between the two dates. If you are counting a period that includes both the first and the last day — like a booking or a leave period — tick "Include the end date" to add the final day. Enter the dates in either order; if the end comes before the start, the tool shows the same total and tells you the dates were reversed. Everything runs in your browser, and leap years are handled by real calendar maths.