This counts the days from today to a date in the future. It is the arithmetic behind every countdown — to a wedding, an exam, a completion date, a flight — and the only real decision it makes for you is whether to count the finishing day itself. The figure given here is the number of nights between the two dates, so a date tomorrow reads as one day rather than two. If you need the inclusive count, the one that treats both today and the target as days on the list, add one.
That single choice explains most of the disagreements between two people looking at the same calendar. Legal and contractual periods in the UK are frequently expressed as clear days, meaning that neither the first nor the last day counts, which yields a figure one lower again. Where a document specifies working days rather than plain days, the working-days calculator is the right tool instead, because bank holidays and the substitute days that follow a weekend Christmas will change the answer materially.
The result also shows the number of complete weeks and the weekday the target falls on, which is usually what people actually want when the count is long. Nothing here depends on the clock: both dates are treated as whole days in UK local time, so the switch between GMT and British Summer Time in March and October has no effect on the total.
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