Is the end date included?

The calculator counts day boundaries between dates. For example, Jan 1 to Jan 2 is 1 calendar day.

Can I calculate reverse date differences?

Yes. If the end date is before the start date, the result is shown as a negative day difference.

No. It only excludes weekends. Holiday calendars can be added later for country-specific business-day logic.

கணிதம்

Calculate calendar days, business days excluding weekends, and total weeks between two dates.

Key terms

Start dateEnd date

Calendar days = end date - start date; business days = calendar days excluding Saturdays and Sundays

The calculator compares two valid calendar dates, counts total day boundaries, then counts only weekdays for business-day output.

1Select valid start and end dates using the date picker.
2Calculate total calendar days using midnight UTC timestamps to avoid daylight-saving drift.
3Walk across the date range and count only Monday through Friday as business days.
4Divide total absolute days by 7 to show elapsed weeks.

Reference

Compare common scenarios quickly. Scroll horizontally on smaller screens.

Reference 1

Reference 2

Reference 3

Start	End	Calendar days	Business days
1 Jan 2026	31 Jan 2026	30	22
1 Apr 2026	30 Apr 2026	29	21
1 Jan 2026	31 Dec 2026	364	260

Yes. Business days exclude Saturdays and Sundays, but this calculator does not exclude public holidays.

Calendar day difference

364 days