DaysUntilNowDate calculators
All six answer the same shape of question — how far apart are two points on the calendar — and each one answers it in the unit somebody is actually asking for.
Age in days calculator
Your age with nothing rounded away — and the date your ten-thousandth day falls on.
Business days calculator
Working days between two dates, with the skipped holidays listed one by one.
Days between dates calculator
Two dates in, and the one switch that decides whether the answer is four or five.
Days from today calculator
Any offset, forwards or back — and the answer to whether today counts.
Time duration calculator
From one stamp to another, down to the minute — and across midnight without flinching.
Weeks between dates calculator
Whole weeks and the days left over — the form a wall planner understands.
A date question almost always turns out to be one of two questions wearing the same coat. Either you have two dates and want the distance between them, or you have one date and a length of time and want to know where you land. Everything in this group is one of those two, and the only real decisions are which unit the answer should be in and which days are allowed to count.
The unit matters more than it sounds. A span of 100 days is also 14 weeks and 2 days, roughly three and a third months, 2,400 hours and about 71 working days, and each of those is the right answer to somebody. Picking the tool that already speaks in your unit saves you the conversion — and the conversion is where the mistakes happen.
Which one answers which question
| What you are asking | Calculator | What comes back |
|---|---|---|
| How far apart are these two dates? | Days between dates | Days, with a switch for whether the end day counts |
| What date is 90 days from now? | Days from today | The date, its weekday, and where it sits in the month |
| How many working days is that? | Business days calculator | Working days, with weekends and US federal holidays taken out |
| How long is it, to the minute? | Time duration calculator | Days, hours and minutes between two date-and-time stamps |
| How many days old is somebody? | Age in days | Days, weeks, whole months, and the 10,000-day mark |
| How many weeks is that? | Weeks between dates | Whole weeks plus the leftover days, not a decimal |
The three at the top of the table are the ones people reach for at work — notice periods, delivery windows, payment terms. The three at the bottom exist because the answer is easier to act on in the unit the question was asked in: a midwife counts weeks, a payroll clerk counts hours, and nobody has ever been told they are 0.075 of a century old.
What all six have in common
They recalculate as you type. There is no Calculate button anywhere on this site. Change a date, change the working week, change the direction, and the figures move under your hands.
They answer in more than one unit. Every result carries the same span expressed a few other ways, because the second question is predictable: how many weeks is that, how many working days, how many hours, where does it land in the month.
They are honest about the day of the boundary. Counting the first day, the last day or both is a convention, not a fact, and the convention changes with the context. Where it changes the answer, the page says which one it used and gives you the switch.
They keep nothing. No account, no saved history, no dates leaving your device. If you want the calculation again tomorrow, copy the link — that is the whole storage system, and it works in a message or a document without anyone signing in.
If your question is about the shape of the calendar rather than the distance across it — which week number today falls in, whether a year is a leap year, when a quarter ends — that is the calendar tools group. If it is about a specific date on the public calendar, the holiday dates tools work those out from the rules, and the holiday date table lists them all in one place.
Frequently asked questions
Which of these six do I want for a deadline?
It depends on what the deadline is written in. “Within 30 days” is a calendar-day offset, so it is the days from today calculator with the direction set to after. “30 business days” skips weekends and holidays and belongs to the business days calculator. If you already have the final date and want to know how much runway is left, that is days between dates. Deadlines written in weeks — notice periods, pregnancy dating, sprint planning — read more cleanly on the weeks calculator, which gives whole weeks plus the leftover days instead of a decimal.
Why do two date calculators give answers one day apart?
Because one of them is counting the gaps between dates and the other is counting the dates themselves. From the 1st to the 5th there are four gaps and five dated days, and both figures have legitimate uses: nights in a hotel are gaps, days of a visa stay are dated days. Every tool here counts gaps by default and says so; the days between calculator has a switch that adds the end day back when you need the other convention.
Can I send somebody the result without them redoing it?
Yes. Every setting you change is written into the address bar, so copying the link copies the calculation — the dates, the direction, the working week, the holiday switch. The person who opens it sees the same figures, worked out again on their own device rather than pulled from a saved record on ours. There is nothing to sign up for and nothing stored, which is also why a link is the only way we can hand a result back to you.
How we calculate this
Every calculator on this page works from one shared piece of date arithmetic rather than six separate ones, so the same span cannot come out differently depending on which tool you opened. Dates are held as UTC midnights and compared as whole days, which is the only way a count stays honest across a daylight saving change: a local midnight is not always 24 hours from the next one, but a UTC midnight always is. The date labelled “today” comes from the clock of the device you are reading on, because today is a local question and anchoring it to a server would be a day wrong for a large part of the world at any given moment.
Months and years are walked out of the calendar rather than approximated. Adding a month keeps the day number and clamps it to the last day of the shorter month, which is the same rule spreadsheets and databases use, so 31 January plus one month is the end of February rather than 2 or 3 March. Working days skip Saturday and Sunday under the default working week and, where the tool offers it, the eleven US federal holidays on their observed dates. Holidays elsewhere fall on different days, so treat any holiday-adjusted figure as the US one unless you have switched the holiday list off.
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