Bū tools

Dates

Days between two dates, add days, weeks or months.

What it does

• Between two dates: how many days, and the same gap in weeks, calendar months, years, Monday-to-Saturday days and business days (Monday to Friday). Count picks what the big number shows. Count the last day adds one day, as for a stay or a leave: from Monday to Friday is then 5 days, not 4.
• Add or subtract: a date plus or minus days, Monday-to-Saturday days, business days, weeks, months or years. You get the date, its day, its week number (ISO, as in Europe), its day of the year and how far it is from today.

Good to know

Mon–Sat days skip Sundays, business days skip weekends; neither skips public holidays (they differ by country and region). Adding a month to 31 January gives the last day of February, like a spreadsheet. Week numbers follow ISO 8601: week 1 holds the first Thursday of the year.

Free, no account, nothing is sent: it runs in your browser, even offline.

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