Date Calculator

Count 90 days forward from today and you'll land about three months out, since 90 days is close to a quarter of a year. The exact date depends on which months you pass through, because they're different lengths, so this date calculator does the counting for you. Type 90, pick days, and you'll get the precise date and the weekday, no calendar flipping required.

Start from your base date, choose add, type the number of days, and read the result. The tool rolls over month and year ends for you, so 25 days after December 20 correctly lands in January. You can switch the unit to weeks, months, or years too, which is handy for due dates, deadlines, notice periods, and renewals.

Flip the toggle to subtract and enter the amount, and the tool counts backward. So 30 days before a deadline shows you the date you'd need to start, and a year before an anniversary gives you the original date. It handles leap years and month lengths, so you don't have to second-guess February or a 31-day month.

Point the start date at the date you're counting back from, choose subtract, type the amount, and pick days. It counts straight back through the months, so 90 days before September 30, 2026 lands on Thursday, July 2, 2026, and 60 days before that same date is August 1, 2026. Month lengths and leap years are handled, so you get the exact day and weekday without flipping a calendar. It's the quick way to answer any days-before or days-prior-to question.

Leave the base date on today, switch to subtract, and enter how many days ago you mean, like 30, 60, or 90. It walks backward day by day and shows the past date plus its weekday, so a 90-days-ago question resolves in one step. If you'd rather count from a specific past date instead of today, just change the start date first, and the same subtract mode still applies.

Adding months keeps the same day number and moves the month forward, so March 15 plus two months is May 15. When the day doesn't exist in the target month, like January 31 plus one month, it rolls into early March, which is the standard behavior. For an exact day count instead, switch the unit to days and the tool counts them straight through.

Switch to the days until mode, pick your target date, and you'll see how many days, weeks, and months are left from today. It's a quick countdown for a holiday, a birthday, a wedding, or a deadline. If the date has already passed, the tool shows how long ago it was instead, so it works both forward and backward.

Set the base date to your start date instead of today, choose add, type 90, and pick days. The tool counts straight through the months for you, so March 26 plus 90 days lands on June 24, and it shows the weekday too. It's the fast way to answer any date-plus-90-days question without flipping a calendar, and it works the same for 30, 60, or any number you need.

180 days is roughly six months, but the exact date depends on the months you pass through, so it's worth counting rather than guessing. Leave the base date on today, add 180 days, and you'll get the precise result date and weekday. The same mode handles the 30, 60, 90, and 120 day marks that cover most notice periods, trial windows, and deadlines.

Yes on both counts. There's no sign-up, no usage limit, and nothing to install, since the whole thing loads instantly in the page. The dates you enter stay on your device and aren't sent anywhere. Bookmark it and you've got a fast way to add days, subtract days, or count down to a date whenever you need one.