Trip Duration Calculator
Work out how many full days fall between two points in the same calendar year. Enter the start and end day-of-year values to reveal the elapsed travel time in days for itineraries, construction projects, or classroom schedules.
Educational information, not professional advice.
Examples
- Depart on day 120 (April 29) and return day 127 (May 6) ⇒ 7 days away
- Project kicks off day 32 and wraps on day 74 ⇒ 42 days of active work
FAQ
Do the dates need to be in the same year?
Yes. Enter day numbers from a single calendar year; for multi-year trips, calculate each year separately and add the results.
Are both the start and end days counted?
The formula returns the difference between the two day numbers. Add one day if you need an inclusive count covering every calendar date.
How do I handle leap years?
Leap years include a day 366. Use the proper ordinal number for February 29 and the rest of the year to keep the math accurate.
Where can I find day-of-year numbers?
Use a day-of-year chart or spreadsheet function such as Excel's `=A1-DATE(YEAR(A1),1,0)` to convert regular dates before entering them here.
Additional Information
- Results are expressed in elapsed days and exclude the departure date by default.
- Remember to add one extra day if you want to count both the starting and ending dates inclusively.