Completely FREE date calculator. No signup, instant answers. Three tools in one: count the days between two dates, add or subtract days, weeks, months, or years from a date, or count only the business days between two dates. Pick a mode and the answer updates as you type.
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Days between two dates
The most common date question is simply "how many days is that?" — between now and a deadline, a wedding, a due date, a trip, a contract end, or a historical event. Enter a start and an end date and the tool gives you the total in days and weeks. There's a choice that matters more than it looks: whether to count both endpoints or just the gap. For "how many days until" you usually want the plain gap; for "how many days does this event run" you usually want both days included. The tool spells out which it's doing so you don't have to second-guess an off-by-one.
Add or subtract time from a date
The second mode answers "what date is X from here?" — 90 days after a filing, 6 weeks before an event, 18 months from a start date, a year from today. Enter a starting date, an amount, a unit, and a direction. Month and year math follows the sensible calendar rule: adding a month to January 31 lands on the last day of February rather than spilling into March, so the results match how deadlines are actually reckoned.
Business days only
Plenty of deadlines are quoted in business days, not calendar days — "ships in 5 business days," "respond within 10 business days," "funds settle in 3 business days." The third mode counts only Monday through Friday between two dates, and also reports how many weekend days it skipped. One honest limitation: it does not know your local public holidays, so for an official deadline that excludes holidays, subtract those days yourself. The tool notes this rather than pretending to a precision it doesn't have.
Why the math is reliable
All calculations run in a fixed calendar frame so a daylight-saving change never silently adds or removes a day — a classic bug in hand-rolled date math. Month lengths and leap years are handled by the real calendar. The result is arithmetic you can hand to a lawyer, a landlord, or a shipping department without re-checking.
Runs entirely in your browser
Nothing you enter is sent anywhere, and there's no account or wait. To find a person's age rather than a raw day count, use the Age Calculator. For legally-framed deadlines, the Small Claims Deadline Calculator and Naturalization Residency Date Calculator apply specific statutory rules on top of the raw dates.
Frequently asked questions
How many days are between two dates?
Use the "days between" mode and enter both dates. You'll get the total in days and weeks, with a choice to count the gap only or to include both the start and end days.
What date will it be 90 days from now?
Use the "add or subtract" mode, enter today's date, set the amount to 90, the unit to days, and the direction to add. The tool shows the resulting date and its day of the week.
Does the business-days count exclude holidays?
It excludes weekends but not public holidays, because those vary by country and region. For an official business-day deadline, subtract the applicable holidays from the result yourself.
Important
This tool provides estimates and general-purpose documents, not financial, tax, legal, or professional advice. Verify important results before relying on them.
Support
Problem with this tool or suggestions for improvement? Please email support@niftyutilities.com.