Date difference and D-day

Count days between dates, include or exclude the start date and optionally exclude weekends.

These results use the example values shown above.

Until the target date

D-87

Date difference87 days

Days using your counting method87 days

Start date excluded · weekends and public holidays included

Suggest improvements

This does not determine legal deadlines or country-specific business days. The initial reference date uses Korea time.

How to use Date difference and D-day

Enter a reference date and target date. Choose whether to count the start date.

More options shows a count excluding Saturday and Sunday. Public holidays remain included. Dates are treated as calendar dates rather than hours in a time zone.

Example
October 1 to October 4 is 3 days apart, or 4 calendar dates when the start is included.

Frequently asked questions

What if the target has passed?

D+ and the signed date difference indicate a past target.

Are public holidays excluded?

No. Only Saturday and Sunday can be excluded.

Reviewed: 2026-10-04 · Report an issue