Day and date calculator: Calculate days between two dates

Enter a start and end date above to see the number of days immediately. For example, from January 1 to December 25, 2026, there are 358 days: 51 weeks and 1 day, or 11 months and 24 days.

Not by default: the calculator uses the difference between dates, so from the 1st to the 2nd is 1 day. To count both the start and end dates, as you would for a vacation, enable “Include end date” to add one day.

Yes. Under “Days between two dates,” check “Add time.” Then enter the hour, minute, and second for the start and end, and choose a time zone for each. Your device’s time zone is selected by default. “Now,” “Start of day,” and “Noon” set the time with one click. The result shows years, months, days, hours, minutes, and seconds, plus the duration in days, hours, minutes, and seconds. For example, from 9:00 in Berlin to 9:00 in New York on the same day in January is 6 hours.

The calculator uses the actual local time. On the night clocks move forward, a day in Germany has only 23 hours; when they move back, it has 25. From March 28, 2026, 12:00 PM, to March 29, 2026, 12:00 PM, it is therefore 1 day but only 23 hours. If a time does not exist because of the change, such as 2:30 AM on March 29, 2026, the calculator treats it as 3:30 AM. If a time occurs twice, such as 2:30 AM on October 25, 2026, it uses the first occurrence. In both cases, a note appears with the result.

Switch to “Date plus/minus,” choose the start date or click “Today,” and enter days, weeks, months or years. 90 days after October 9, 2026 is January 7, 2027, a Thursday in calendar week 1. Select “Subtract” to count backward. Years and months are applied before weeks and days. If the day does not exist in the target month, the result falls on the last day of that month: January 31, 2026 plus 1 month is February 28, 2026.

The results for “Days between two dates” automatically include the number of working days: from January 1 to December 25, 2026, there are 256. With “Working days,” you can move a date forward or back by a number of working days. Choose “Working days (Mon–Fri)” or “Including Saturdays (Mon–Sat)” as the counting method if Saturday should count.

No. Public holidays vary by country, region and year, so the calculator only excludes weekends. The working-day count is therefore an upper limit from which you need to subtract public holidays yourself.

Switch to “Age” and enter your date of birth. Without a reference date, the calculator counts up to today and also shows the months, weeks, days and hours since your birth, the day of the week you were born and your next birthday.

For date results, the calculator shows the ISO 8601 calendar week and, for a calculated date, the day of the year. The week starts on Monday, and the first week of a year is the one containing the first Thursday. January 7, 2027 is therefore in week 1, while December 31, 2026 is still in week 53.

No. The calculation runs entirely in your browser; nothing is sent to a server to produce the result. Whenever you change something, the calculator puts your inputs in the address bar so you can share the calculation using “Share link.”