Days Until Calculator

What Is a Days Until Count?

A days until count is how many days are left before a date: a holiday, a birthday, a wedding, a due date or a deadline. The calculator counts from today, in your own time zone, and has three tools:

• Days Until: a countdown to a holiday, your next birthday or anniversary, or any date you pick, with an upcoming holidays list.
• Days Between Dates: the days, weekdays and weekend days from one date to another, past or future.
• Add or Subtract Days: the date a number of days or business days before or after another date, such as 90 days from today.

Holidays with moving dates are worked out for each year:

Which calculator should I use?

• Days Until Calculator: for days between dates, countdowns and adding days.
• Age Calculator: for your exact age in years, months and days, and your next birthday.
• Hours Calculator: for the hours and minutes between two times on the same day.

How to Calculate the Days Between Two Dates

Subtract the earlier date from the later one, counting whole days:

• Start date: today for a countdown. It isn't counted itself, so tomorrow is 1 day away.
• End date: the day you're counting to. To count both the first and last day, as for a trip, add 1.
• Weekdays: of those days, the Mondays to Fridays. Each full week has 5, and the few days left over are checked one by one.
• Months and days: the most whole months that fit, then the days left. A month from January 31 is February 28.

Example

• From Monday, March 2, 2026 to Friday, December 25, 2026 is 298 days: 42 weeks and 4 days, or 9 months and 23 days, with 214 weekdays.
• A trip from Monday, July 6 to Friday, July 10, 2026, counting both ends, is 5 days.
• 90 days after March 2, 2026 is Sunday, May 31, 2026. 10 business days after it is Monday, March 16, 2026.

How to Use the Days Until Calculator

"How many days until Christmas, how many weekdays is that, and what date is 90 days from today?" This calculator answers that.

Let's go through each box. They are already filled in when the calculator opens, counting from today, so you can follow along and then change any box.

On the Days Until tab:

• Count Down To: Choose Christmas. There are 17 US holidays, plus "A date I choose" and "Next birthday or anniversary".
• Date: Filled in and greyed out for a holiday, with its next date. For your own date, pick it here, from 1900 to 2199. For a birthday or anniversary, pick the original date and the count goes to the next one.

On the Days Between Dates tab:

• Start Date and End Date: Pick the two dates. They open on today and December 31. The end can be before the start.
• Count the End Day: Choose No for the gap between the dates, or Yes to count every day from the first to the last.

On the Add or Subtract Days tab:

• Start Date: Opens on today.
• Add or Subtract: Choose Add days to look ahead, or Subtract days to look back.
• Number of Days: Enter 90. A whole number from 0 to 100,000.
• Count: Choose Calendar days, or Business days to skip Saturdays and Sundays.

Calculate and Reset

Click Calculate to see your results. Picking a holiday shows its countdown right away. If a box has a problem, such as a missing date, a message pops up under it instead. You get:

• Your Results: a short summary in words, with the full dates and the weekday each falls on.
• Days Until: the days to go as the headline, with weeks and days, months and days, weekdays to go and hours. The Upcoming Holidays table lists every holiday's next date and the days until it, soonest first.
• Days Between Dates: the days as the headline, with weekdays, weekend days, weeks and days, and months and days (or years, months and days).
• Add or Subtract Days: the new date as the headline, with its day of the week, day of the year, week number and how far it is from today.
• Share Results: a link that opens this calculator on the same tab with your dates filled in. A shared countdown counts from the day it's opened.

Click Reset to put the boxes on the tab you're using back to their defaults. Business days skip weekends but not public holidays, so check holiday closures for deadlines.