What can a date calculator do?
How long between two dates gives you the span in calendar years, months and days, plus the raw day count, weeks and working days. Both are useful for different things: a contract cares about calendar months, a project plan cares about days. Counting down to a fixed day is the same span: the Thanksgiving hub states the date once, Thursday 26 November 2026, and leaves the days-until count to this calculator.
The money counts use the same span: the days until a bill is due, the gap between two paydays, the days interest has run on a debt. The money hub collects those jobs beside the printable trackers.
What date is X days from a date counts forward or backward: a negative amount subtracts, so “what date was it 30 days ago” is -30 days from today. Days, weeks, months and years are all available, and months behave the way a calendar does rather than as a fixed number of days.
How many working days counts Monday to Friday between two dates, and shows how many weekend days were skipped.
How long is N working days answers the notice-period question. You have 60 working days: how much is that in months? It counts forward from your start date (the start date itself is day 1 when it falls Monday to Friday), lands on the last working day, and gives the calendar-true span, the end date and the weekend days in between. Public holidays are still not excluded, so treat the result as an upper bound and subtract the holidays you know about.
How do I subtract days from a date?
Pick “What date is X days from a date?”, type your start date, and enter a negative amount. The tool counts backward: -10 days gives the date ten days earlier, -3 weeks three weeks earlier, -2 months two months earlier. The answer arrives as you type, and the line under the big date names what was counted (2024-02-19 · -10 days from 2024-02-29), so a wrong sign or unit is visible at a glance.
“What date was it 30 days ago?” is the same job from the other end. The start date begins set to today, so a negative amount gives you the days-ago date without changing anything else.
Months follow the calendar in both directions: subtract one month from 31 March and you land on the last day of February, because there is no 31st there. That is the rule the last question below explains in full.
Why is the end date a choice?
Ask two people how many days are in “1 March to 3 March” and you will get 2 and 3. Both are right, for different questions. A hotel stay is two nights. A three-day event is three days.
Rather than pick one and be wrong for half of visitors, the checkbox makes it explicit. Notice periods and deadlines in contracts usually count the end date; durations and stays usually do not.
How are working days counted?
The working-day count excludes Saturdays and Sundays and nothing else. Public holidays are not excluded, and they cannot sensibly be: they differ by country, and within Germany, Switzerland and Austria they differ by region, so a fixed list would produce a confidently wrong answer for most people.
If your deadline depends on holidays, use this number as the upper bound and subtract the holidays you know about.
Why isn’t a month 30 days?
Adding one month to the 31st of January gives the last day of February (the 28th in three of four years, the 29th in a leap year) because the 31st does not exist there. Add another month and you land on the same day of March (the 28th or 29th), not the 31st. That is how calendars work and how contracts are read, and it is why “add 60 days” and “add 2 months” give different answers.
Counting school days instead? The 100th day of school calculator counts weekdays from the first day of school, skips the holidays and the winter break, and prints a 100 chart for the classroom.
Questions
Is the end date counted?
Only if you tick the box. That single choice is the most common source of off-by-one disagreements, so it is a visible option rather than a silent assumption.
Are public holidays excluded from working days?
No, only Saturdays and Sundays. Public holidays differ by country and by region within a country, so excluding a fixed set would be wrong for most visitors.
How are months counted?
Calendar-wise, the way people count them: from the 31st of January, one month later is the last day of February (the 28th in three of four years, the 29th in a leap year), because there is no 31st. Adding a month twice is therefore not always the same as adding two months. The span between two dates is counted the same way: whole months first, then the remaining days.
Does daylight saving affect the result?
No. Dates are handled at UTC midnight internally, so a clock change cannot turn 30 days into 29 days and 23 hours.
In "how long is N working days", does the start date count?
Yes, when it falls Monday to Friday: a notice period that starts on a Monday counts that Monday as day 1. A weekend start moves day 1 to the next Monday, and the span still begins on your start date, so that first weekend is counted among the weekend days shown.
Why do years, months and days not add up to the day count?
Because the two are counted differently on purpose. Years, months and days follow the calendar (a month is whatever that month is, 28 to 31 days), while the day count is the raw distance between the two dates. Turning the calendar parts back into days gives a different number, and that difference is not an error: it is the difference between how people speak about time and how many midnights actually passed.