How days are counted
The day counter counts the number of midnights between the two dates — so from Monday to Tuesday is one day. Choose Include the end date to count both days instead, which is how you'd count the length of an event such as a three-day conference (Friday through Sunday = 3 days).
Weekdays are Monday through Friday. Public holidays aren't subtracted because they vary by country and employer, so remove any that apply if you're counting working days.
Common uses
- Countdowns to birthdays, weddings, vacations and holidays
- Days since a milestone — sobriety, a new habit, starting a job
- Deadlines and notice periods, counted in calendar days or weekdays
Need to add or subtract days from a date instead? Use the Date Calculator.
Worked example
How many days from January 1 to Christmas Day in a non-leap year? January 1 is day 1 of the year and December 25 is day 359, so the gap is 359 − 1 = 358 days, or 51 weeks and 1 day. Of those, 256 are weekdays and 102 fall on weekends (in 2026, when January 1 is a Thursday). If you include Christmas Day itself in the count, the total becomes 359.
Day number of the year
The first day of each month, counted from January 1 as day 1:
| Month | Starts on day | Month | Starts on day |
|---|---|---|---|
| January | 1 | July | 182 |
| February | 32 | August | 213 |
| March | 60 | September | 244 |
| April | 91 | October | 274 |
| May | 121 | November | 305 |
| June | 152 | December | 335 |
In a leap year, add 1 to every figure from March onwards. To find the days between two dates in the same year, look up each date's day number and subtract.
Frequently asked questions
How many days are left in the year?
Set the date to December 31 and leave "Counting from" as today. Choose "Include the end date" if you want December 31 itself counted.
Does the counter include today?
By default it counts today but not the target date, so tomorrow is "1 day" away. That matches how people normally talk about countdowns. Switch on "Include the end date" to count both ends.
How do I count only working days?
The Weekdays figure gives Monday-to-Friday days in the period. Subtract any public holidays or days off that fall within it to get your actual working days.
Why is my count different from another calculator's?
Almost always because of whether the start or end date is included — the answer differs by exactly one day. Time zones can also shift a result by a day if another tool counts hours rather than calendar dates. This counter uses whole calendar days on your device's date.
Can I count days since a past date?
Yes. Enter any date in the past and the counter switches to "days since" — handy for anniversaries, streaks and tracking how long something has lasted.
How many days until my birthday?
Enter the date of your next birthday. For your age in years, months and days instead, use the Age Calculator.